diff --git a/pkgs/applications/misc/therion/default.nix b/pkgs/applications/misc/therion/default.nix
index fbe734ddc1b6..3dd72b9f6829 100644
--- a/pkgs/applications/misc/therion/default.nix
+++ b/pkgs/applications/misc/therion/default.nix
@@ -5,10 +5,9 @@
 , pkg-config
 , perl
 , tcl
-, tcllib
+, tclPackages
 , tk
 , expat
-, bwidget
 , python3
 , texliveTeTeX
 , survex
@@ -25,7 +24,6 @@
 , sqlite
 , libtiff
 , curl
-, tkimg
 }:
 
 stdenv.mkDerivation rec {
@@ -59,7 +57,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     expat
-    tkimg
+    tclPackages.tkimg
     proj
     wxGTK32
     vtk
@@ -74,8 +72,8 @@ stdenv.mkDerivation rec {
     curl
     fmt
     tcl
-    tcllib
-    bwidget
+    tclPackages.tcllib
+    tclPackages.bwidget
   ];
 
   fixupPhase = ''
diff --git a/pkgs/applications/science/electronics/openroad/default.nix b/pkgs/applications/science/electronics/openroad/default.nix
index 65bf094c2a2c..cae21d7bba4b 100644
--- a/pkgs/applications/science/electronics/openroad/default.nix
+++ b/pkgs/applications/science/electronics/openroad/default.nix
@@ -26,7 +26,7 @@
 , readline
 , spdlog
 , tcl
-, tcllib
+, tclPackages
 , xorg
 , yosys
 , zlib
@@ -72,7 +72,7 @@ mkDerivation rec {
     readline
     spdlog
     tcl
-    tcllib
+    tclPackages.tcllib
     yosys
     xorg.libX11
     zlib
diff --git a/pkgs/applications/version-management/fossil/default.nix b/pkgs/applications/version-management/fossil/default.nix
index a00cc8e78cc7..77658b58f260 100644
--- a/pkgs/applications/version-management/fossil/default.nix
+++ b/pkgs/applications/version-management/fossil/default.nix
@@ -12,7 +12,7 @@
 , sqlite
 , ed
 , which
-, tcllib
+, tclPackages
 , withJson ? true
 }:
 
@@ -28,7 +28,7 @@ stdenv.mkDerivation (finalAttrs: {
   # required for build time tool `./tools/translate.c`
   depsBuildBuild = [ buildPackages.stdenv.cc ];
 
-  nativeBuildInputs = [ installShellFiles tcl tcllib ];
+  nativeBuildInputs = [ installShellFiles tcl tclPackages.tcllib ];
 
   buildInputs = [ zlib openssl readline which ed ]
     ++ lib.optional stdenv.hostPlatform.isDarwin libiconv
diff --git a/pkgs/by-name/em/emacspeak/package.nix b/pkgs/by-name/em/emacspeak/package.nix
index 6c18af7807ea..3e9b753be964 100644
--- a/pkgs/by-name/em/emacspeak/package.nix
+++ b/pkgs/by-name/em/emacspeak/package.nix
@@ -5,7 +5,7 @@
 , makeWrapper
 , stdenv
 , tcl
-, tclx
+, tclPackages
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -27,7 +27,7 @@ stdenv.mkDerivation (finalAttrs: {
   buildInputs = [
     espeak-ng
     tcl
-    tclx
+    tclPackages.tclx
   ];
 
   strictDeps = true;
@@ -49,7 +49,7 @@ stdenv.mkDerivation (finalAttrs: {
     find "$d" -type f -not -executable -execdir chmod 644 {} +
     makeWrapper ${lib.getExe emacs} $out/bin/emacspeak \
         --set DTK_PROGRAM "${placeholder "out"}/share/emacs/site-lisp/emacspeak/servers/espeak" \
-        --set TCLLIBPATH "${tclx}/lib" \
+        --set TCLLIBPATH "${tclPackages.tclx}/lib" \
         --add-flags '-l "${placeholder "out"}/share/emacs/site-lisp/emacspeak/lisp/emacspeak-setup.elc"'
   '';
 
diff --git a/pkgs/by-name/ke/keydb/package.nix b/pkgs/by-name/ke/keydb/package.nix
index 265f8a884fcb..ed6ba8bd518c 100644
--- a/pkgs/by-name/ke/keydb/package.nix
+++ b/pkgs/by-name/ke/keydb/package.nix
@@ -12,7 +12,7 @@
   jemalloc,
   which,
   tcl,
-  tcltls,
+  tclPackages,
   ps,
   getconf,
   nixosTests,
@@ -60,11 +60,14 @@ stdenv.mkDerivation (finalAttrs: {
 
   # darwin currently lacks a pure `pgrep` which is extensively used here
   doCheck = !stdenv.hostPlatform.isDarwin;
-  nativeCheckInputs = [
-    which
-    tcl
-    ps
-  ] ++ lib.optionals stdenv.hostPlatform.isStatic [ getconf ] ++ lib.optionals tlsSupport [ tcltls ];
+  nativeCheckInputs =
+    [
+      which
+      tcl
+      ps
+    ]
+    ++ lib.optionals stdenv.hostPlatform.isStatic [ getconf ]
+    ++ lib.optionals tlsSupport [ tclPackages.tcltls ];
   checkPhase = ''
     runHook preCheck
 
diff --git a/pkgs/by-name/re/remind/package.nix b/pkgs/by-name/re/remind/package.nix
index bbeadc7773cd..eb01ac3c885d 100644
--- a/pkgs/by-name/re/remind/package.nix
+++ b/pkgs/by-name/re/remind/package.nix
@@ -3,7 +3,7 @@
   stdenv,
   fetchurl,
   tk,
-  tcllib,
+  tclPackages,
   tcl,
   tkremind ? null,
   withGui ?
@@ -23,7 +23,7 @@ tcl.mkTclDerivation rec {
   };
 
   propagatedBuildInputs = lib.optionals withGui [
-    tcllib
+    tclPackages.tcllib
     tk
   ];
 
diff --git a/pkgs/by-name/xf/xfs-undelete/package.nix b/pkgs/by-name/xf/xfs-undelete/package.nix
index 390a19d1f06c..030f3324fc59 100644
--- a/pkgs/by-name/xf/xfs-undelete/package.nix
+++ b/pkgs/by-name/xf/xfs-undelete/package.nix
@@ -4,7 +4,7 @@
 , makeWrapper
 , coreutils
 , tcl-8_6
-, tcllib
+, tclPackages
 , installShellFiles
 }:
 
@@ -19,7 +19,7 @@ stdenv.mkDerivation {
     hash = "sha256-ENa/r3+o7abW8iun6V/2LhTVmFVSwVM6v46KXBcKJ1g=";
   };
 
-  buildInputs = [ tcl-8_6 tcllib coreutils ];
+  buildInputs = [ tcl-8_6 tclPackages.tcllib coreutils ];
   nativeBuildInputs = [ makeWrapper tcl-8_6.tclPackageHook installShellFiles ];
 
   tclWrapperArgs = [ "--prefix" "PATH" ":" (lib.makeBinPath [ tcl-8_6 ]) ];
diff --git a/pkgs/development/interpreters/python/cpython/2.7/default.nix b/pkgs/development/interpreters/python/cpython/2.7/default.nix
index abb66b38e3cc..4d8e03695de3 100644
--- a/pkgs/development/interpreters/python/cpython/2.7/default.nix
+++ b/pkgs/development/interpreters/python/cpython/2.7/default.nix
@@ -8,7 +8,7 @@
 , openssl
 , readline
 , sqlite
-, tcl ? null, tk ? null, tix ? null, libX11 ? null, x11Support ? false
+, tcl ? null, tk ? null, tclPackages, libX11 ? null, x11Support ? false
 , zlib
 , self
 , configd, coreutils
@@ -273,8 +273,8 @@ in with passthru; stdenv.mkDerivation ({
 
     setupHook = python-setup-hook sitePackages;
 
-    postPatch = lib.optionalString (x11Support && (tix != null)) ''
-          substituteInPlace "Lib/lib-tk/Tix.py" --replace "os.environ.get('TIX_LIBRARY')" "os.environ.get('TIX_LIBRARY') or '${tix}/lib'"
+    postPatch = lib.optionalString (x11Support && ((tclPackages.tix or null) != null)) ''
+          substituteInPlace "Lib/lib-tk/Tix.py" --replace "os.environ.get('TIX_LIBRARY')" "os.environ.get('TIX_LIBRARY') or '${tclPackages.tix}/lib'"
     '';
 
     postInstall =
diff --git a/pkgs/development/interpreters/python/cpython/default.nix b/pkgs/development/interpreters/python/cpython/default.nix
index 37764506e296..32f27a242125 100644
--- a/pkgs/development/interpreters/python/cpython/default.nix
+++ b/pkgs/development/interpreters/python/cpython/default.nix
@@ -35,7 +35,7 @@
 , tzdata
 , withGdbm ? !stdenv.hostPlatform.isWindows, gdbm
 , withReadline ? !stdenv.hostPlatform.isWindows, readline
-, x11Support ? false, tcl, tk, tix, libX11, xorgproto
+, x11Support ? false, tcl, tk, tclPackages, libX11, xorgproto
 
 # splicing/cross
 , pythonAttr ? "python${sourceVersion.major}${sourceVersion.minor}"
@@ -323,10 +323,10 @@ in with passthru; stdenv.mkDerivation (finalAttrs: {
   '' + optionalString mimetypesSupport ''
     substituteInPlace Lib/mimetypes.py \
       --replace-fail "@mime-types@" "${mailcap}"
-  '' + optionalString (pythonOlder "3.13" && x11Support && (tix != null)) ''
+  '' + optionalString (pythonOlder "3.13" && x11Support && ((tclPackages.tix or null) != null)) ''
     substituteInPlace "Lib/tkinter/tix.py" --replace-fail \
       "os.environ.get('TIX_LIBRARY')" \
-      "os.environ.get('TIX_LIBRARY') or '${tix}/lib'"
+      "os.environ.get('TIX_LIBRARY') or '${tclPackages.tix}/lib'"
   '';
 
   env = {
diff --git a/pkgs/development/interpreters/python/pypy/default.nix b/pkgs/development/interpreters/python/pypy/default.nix
index 3dcbce42cf0a..4e8199af56b3 100644
--- a/pkgs/development/interpreters/python/pypy/default.nix
+++ b/pkgs/development/interpreters/python/pypy/default.nix
@@ -1,7 +1,7 @@
 { lib, stdenv, substituteAll, fetchurl
 , zlibSupport ? true, zlib
 , bzip2, pkg-config, libffi, libunwind, Security
-, sqlite, openssl, ncurses, python, expat, tcl, tk, tix, libX11
+, sqlite, openssl, ncurses, python, expat, tcl, tk, tclPackages, libX11
 , gdbm, db, xz, python-setup-hook
 , optimizationLevel ? "jit", boehmgc
 # For the Python package set
@@ -98,7 +98,7 @@ in with passthru; stdenv.mkDerivation rec {
       --replace "multiprocessing.cpu_count()" "$NIX_BUILD_CORES"
 
     substituteInPlace "lib-python/${if isPy3k then "3/tkinter/tix.py" else "2.7/lib-tk/Tix.py"}" \
-      --replace "os.environ.get('TIX_LIBRARY')" "os.environ.get('TIX_LIBRARY') or '${tix}/lib'"
+      --replace "os.environ.get('TIX_LIBRARY')" "os.environ.get('TIX_LIBRARY') or '${tclPackages.tix}/lib'"
   '';
 
   buildPhase = ''
diff --git a/pkgs/development/r-modules/default.nix b/pkgs/development/r-modules/default.nix
index d17cf9941491..708192d930ca 100644
--- a/pkgs/development/r-modules/default.nix
+++ b/pkgs/development/r-modules/default.nix
@@ -474,7 +474,7 @@ let
     RMySQL = with pkgs; [ zlib libmysqlclient openssl.dev ];
     RNetCDF = with pkgs; [ netcdf udunits ];
     RODBC = [ pkgs.libiodbc ];
-    rpanel = [ pkgs.bwidget ];
+    rpanel = [ pkgs.tclPackages.bwidget ];
     Rpoppler = [ pkgs.poppler ];
     RPostgres = with pkgs; [ postgresql ];
     RPostgreSQL = with pkgs; [ postgresql postgresql ];
@@ -1460,9 +1460,9 @@ let
 
     rpanel = old.rpanel.overrideAttrs (attrs: {
       preConfigure = ''
-        export TCLLIBPATH="${pkgs.bwidget}/lib/bwidget${pkgs.bwidget.version}"
+        export TCLLIBPATH="${pkgs.tclPackages.bwidget}/lib/bwidget${pkgs.tclPackages.bwidget.version}"
       '';
-      TCLLIBPATH = "${pkgs.bwidget}/lib/bwidget${pkgs.bwidget.version}";
+      TCLLIBPATH = "${pkgs.tclPackages.bwidget}/lib/bwidget${pkgs.tclPackages.bwidget.version}";
     });
 
     networkscaleup = old.networkscaleup.overrideAttrs (attrs: {
diff --git a/pkgs/development/libraries/bwidget/default.nix b/pkgs/development/tcl-modules/by-name/bw/bwidget/package.nix
similarity index 91%
rename from pkgs/development/libraries/bwidget/default.nix
rename to pkgs/development/tcl-modules/by-name/bw/bwidget/package.nix
index 8a408864c582..161324f9e6e0 100644
--- a/pkgs/development/libraries/bwidget/default.nix
+++ b/pkgs/development/tcl-modules/by-name/bw/bwidget/package.nix
@@ -1,6 +1,6 @@
-{ lib, fetchurl, tcl, tk }:
+{ lib, fetchurl, mkTclDerivation, tk }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "bwidget";
   version = "1.10.0";
 
diff --git a/pkgs/tools/misc/expect/0004-enable-cross-compilation.patch b/pkgs/development/tcl-modules/by-name/ex/expect/0004-enable-cross-compilation.patch
similarity index 100%
rename from pkgs/tools/misc/expect/0004-enable-cross-compilation.patch
rename to pkgs/development/tcl-modules/by-name/ex/expect/0004-enable-cross-compilation.patch
diff --git a/pkgs/tools/misc/expect/fix-build-time-run-tcl.patch b/pkgs/development/tcl-modules/by-name/ex/expect/fix-build-time-run-tcl.patch
similarity index 100%
rename from pkgs/tools/misc/expect/fix-build-time-run-tcl.patch
rename to pkgs/development/tcl-modules/by-name/ex/expect/fix-build-time-run-tcl.patch
diff --git a/pkgs/tools/misc/expect/fix-darwin-bsd-clang16.patch b/pkgs/development/tcl-modules/by-name/ex/expect/fix-darwin-bsd-clang16.patch
similarity index 100%
rename from pkgs/tools/misc/expect/fix-darwin-bsd-clang16.patch
rename to pkgs/development/tcl-modules/by-name/ex/expect/fix-darwin-bsd-clang16.patch
diff --git a/pkgs/tools/misc/expect/freebsd-unversioned.patch b/pkgs/development/tcl-modules/by-name/ex/expect/freebsd-unversioned.patch
similarity index 100%
rename from pkgs/tools/misc/expect/freebsd-unversioned.patch
rename to pkgs/development/tcl-modules/by-name/ex/expect/freebsd-unversioned.patch
diff --git a/pkgs/tools/misc/expect/default.nix b/pkgs/development/tcl-modules/by-name/ex/expect/package.nix
similarity index 100%
rename from pkgs/tools/misc/expect/default.nix
rename to pkgs/development/tcl-modules/by-name/ex/expect/package.nix
diff --git a/pkgs/development/libraries/incrtcl/default.nix b/pkgs/development/tcl-modules/by-name/in/incrtcl/package.nix
similarity index 92%
rename from pkgs/development/libraries/incrtcl/default.nix
rename to pkgs/development/tcl-modules/by-name/in/incrtcl/package.nix
index 4558ebbd0dcf..7b1397ac1bb8 100644
--- a/pkgs/development/libraries/incrtcl/default.nix
+++ b/pkgs/development/tcl-modules/by-name/in/incrtcl/package.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchurl, writeText, tcl }:
+{ lib, stdenv, mkTclDerivation, fetchurl, writeText, tcl }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "incrtcl";
   version = "4.2.3";
 
diff --git a/pkgs/development/libraries/itktcl/default.nix b/pkgs/development/tcl-modules/by-name/it/itktcl/package.nix
similarity index 92%
rename from pkgs/development/libraries/itktcl/default.nix
rename to pkgs/development/tcl-modules/by-name/it/itktcl/package.nix
index b6a4788075f7..aefefa8c3ceb 100644
--- a/pkgs/development/libraries/itktcl/default.nix
+++ b/pkgs/development/tcl-modules/by-name/it/itktcl/package.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchurl, tcl, tk, incrtcl }:
+{ lib, stdenv, fetchurl, mkTclDerivation, tk, incrtcl }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "itk-tcl";
   version = "4.1.0";
 
diff --git a/pkgs/development/libraries/mustache-tcl/default.nix b/pkgs/development/tcl-modules/by-name/mu/mustache-tcl/package.nix
similarity index 90%
rename from pkgs/development/libraries/mustache-tcl/default.nix
rename to pkgs/development/tcl-modules/by-name/mu/mustache-tcl/package.nix
index 063c8ea36f71..5281f40a78e8 100644
--- a/pkgs/development/libraries/mustache-tcl/default.nix
+++ b/pkgs/development/tcl-modules/by-name/mu/mustache-tcl/package.nix
@@ -1,6 +1,6 @@
-{ lib, fetchFromGitHub, tcl, tcllib }:
+{ lib, fetchFromGitHub, mkTclDerivation, tcllib }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "mustache-tcl";
   version = "1.1.3.4";
 
diff --git a/pkgs/by-name/pd/pdf4tcl/package.nix b/pkgs/development/tcl-modules/by-name/pd/pdf4tcl/package.nix
similarity index 93%
rename from pkgs/by-name/pd/pdf4tcl/package.nix
rename to pkgs/development/tcl-modules/by-name/pd/pdf4tcl/package.nix
index 94ba20ebd742..07d059c042d3 100644
--- a/pkgs/by-name/pd/pdf4tcl/package.nix
+++ b/pkgs/development/tcl-modules/by-name/pd/pdf4tcl/package.nix
@@ -1,10 +1,10 @@
 {
   lib,
-  tcl,
+  mkTclDerivation,
   fetchzip,
 }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "pdf4tcl";
   version = "0.9.4";
 
diff --git a/pkgs/development/libraries/tcl-fcgi/default.nix b/pkgs/development/tcl-modules/by-name/tc/tcl-fcgi/package.nix
similarity index 90%
rename from pkgs/development/libraries/tcl-fcgi/default.nix
rename to pkgs/development/tcl-modules/by-name/tc/tcl-fcgi/package.nix
index 5451c5186a4e..49d23ddd9a72 100644
--- a/pkgs/development/libraries/tcl-fcgi/default.nix
+++ b/pkgs/development/tcl-modules/by-name/tc/tcl-fcgi/package.nix
@@ -1,6 +1,6 @@
-{ lib, fetchFromGitHub, tcl, tclx }:
+{ lib, fetchFromGitHub, mkTclDerivation, tclx }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "tcl-fcgi";
   version = "0.5.0";
 
diff --git a/pkgs/by-name/tc/tclcurl/package.nix b/pkgs/development/tcl-modules/by-name/tc/tclcurl/package.nix
similarity index 94%
rename from pkgs/by-name/tc/tclcurl/package.nix
rename to pkgs/development/tcl-modules/by-name/tc/tclcurl/package.nix
index 2bcfef25a3bd..9e967de825bc 100644
--- a/pkgs/by-name/tc/tclcurl/package.nix
+++ b/pkgs/development/tcl-modules/by-name/tc/tclcurl/package.nix
@@ -1,11 +1,11 @@
 {
   lib,
-  tcl,
+  mkTclDerivation,
   fetchFromGitHub,
   curl,
 }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "tclcurl";
   version = "7.22.1";
 
diff --git a/pkgs/development/libraries/tcllib/default.nix b/pkgs/development/tcl-modules/by-name/tc/tcllib/package.nix
similarity index 93%
rename from pkgs/development/libraries/tcllib/default.nix
rename to pkgs/development/tcl-modules/by-name/tc/tcllib/package.nix
index a5bfba8b0559..8ec83df8b6ed 100644
--- a/pkgs/development/libraries/tcllib/default.nix
+++ b/pkgs/development/tcl-modules/by-name/tc/tcllib/package.nix
@@ -1,11 +1,11 @@
 { lib
 , fetchzip
-, tcl
+, mkTclDerivation
 , critcl
 , withCritcl ? true
 }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "tcllib";
   version = "1.21";
 
diff --git a/pkgs/by-name/tc/tclmagick/package.nix b/pkgs/development/tcl-modules/by-name/tc/tclmagick/package.nix
similarity index 94%
rename from pkgs/by-name/tc/tclmagick/package.nix
rename to pkgs/development/tcl-modules/by-name/tc/tclmagick/package.nix
index f5d0bc4b152f..ad688ec56de4 100644
--- a/pkgs/by-name/tc/tclmagick/package.nix
+++ b/pkgs/development/tcl-modules/by-name/tc/tclmagick/package.nix
@@ -1,12 +1,12 @@
 {
   lib,
-  tcl,
+  mkTclDerivation,
   fetchzip,
   graphicsmagick,
   tk,
 }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "tclmagick";
   version = "1.3.43";
 
diff --git a/pkgs/development/interpreters/tclreadline/default.nix b/pkgs/development/tcl-modules/by-name/tc/tclreadline/package.nix
similarity index 97%
rename from pkgs/development/interpreters/tclreadline/default.nix
rename to pkgs/development/tcl-modules/by-name/tc/tclreadline/package.nix
index 57f7f9a7b194..62880ee5323a 100644
--- a/pkgs/development/interpreters/tclreadline/default.nix
+++ b/pkgs/development/tcl-modules/by-name/tc/tclreadline/package.nix
@@ -4,11 +4,11 @@
 , autoconf
 , libtool
 , readline
-, tcl
+, mkTclDerivation
 , tk
 }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "tclreadline";
   version = "2.4.0";
 
diff --git a/pkgs/development/libraries/tcltls/default.nix b/pkgs/development/tcl-modules/by-name/tc/tcltls/package.nix
similarity index 89%
rename from pkgs/development/libraries/tcltls/default.nix
rename to pkgs/development/tcl-modules/by-name/tc/tcltls/package.nix
index dbc095b64e0b..cb32bf4a7ba8 100644
--- a/pkgs/development/libraries/tcltls/default.nix
+++ b/pkgs/development/tcl-modules/by-name/tc/tcltls/package.nix
@@ -1,6 +1,6 @@
-{ lib, fetchurl, tcl, openssl }:
+{ lib, fetchurl, mkTclDerivation, openssl }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "tcltls";
   version = "1.7.22";
 
diff --git a/pkgs/by-name/tc/tcludp/package.nix b/pkgs/development/tcl-modules/by-name/tc/tcludp/package.nix
similarity index 95%
rename from pkgs/by-name/tc/tcludp/package.nix
rename to pkgs/development/tcl-modules/by-name/tc/tcludp/package.nix
index 890b0d4366fc..073a93432fda 100644
--- a/pkgs/by-name/tc/tcludp/package.nix
+++ b/pkgs/development/tcl-modules/by-name/tc/tcludp/package.nix
@@ -1,10 +1,10 @@
 {
   lib,
-  tcl,
+  mkTclDerivation,
   fetchfossil,
 }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "tcludp";
   version = "1.0.11";
 
diff --git a/pkgs/by-name/tc/tclvfs/package.nix b/pkgs/development/tcl-modules/by-name/tc/tclvfs/package.nix
similarity index 95%
rename from pkgs/by-name/tc/tclvfs/package.nix
rename to pkgs/development/tcl-modules/by-name/tc/tclvfs/package.nix
index 9ac69b5bb153..0fde102cc2a7 100644
--- a/pkgs/by-name/tc/tclvfs/package.nix
+++ b/pkgs/development/tcl-modules/by-name/tc/tclvfs/package.nix
@@ -1,10 +1,10 @@
 {
   lib,
-  tcl,
+  mkTclDerivation,
   fetchzip,
 }:
 
-tcl.mkTclDerivation {
+mkTclDerivation {
   pname = "tclvfs";
   version = "1.4-unstable-2023-11-23";
 
diff --git a/pkgs/development/libraries/tclx/default.nix b/pkgs/development/tcl-modules/by-name/tc/tclx/package.nix
similarity index 94%
rename from pkgs/development/libraries/tclx/default.nix
rename to pkgs/development/tcl-modules/by-name/tc/tclx/package.nix
index 5e3a73febe9b..8ed3bb6f5931 100644
--- a/pkgs/development/libraries/tclx/default.nix
+++ b/pkgs/development/tcl-modules/by-name/tc/tclx/package.nix
@@ -1,9 +1,9 @@
 { lib
 , fetchFromGitHub
-, tcl
+, mkTclDerivation
 }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "tclx";
   version = "8.6.3";
 
diff --git a/pkgs/by-name/td/tdom/package.nix b/pkgs/development/tcl-modules/by-name/td/tdom/package.nix
similarity index 94%
rename from pkgs/by-name/td/tdom/package.nix
rename to pkgs/development/tcl-modules/by-name/td/tdom/package.nix
index a9b96c8d940a..38ac7acfbcf0 100644
--- a/pkgs/by-name/td/tdom/package.nix
+++ b/pkgs/development/tcl-modules/by-name/td/tdom/package.nix
@@ -1,13 +1,13 @@
 {
   lib,
-  tcl,
+  mkTclDerivation,
   fetchzip,
   expat,
   gumbo,
   pkg-config,
 }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "tdom";
   version = "0.9.5";
 
diff --git a/pkgs/development/libraries/tix/duplicated-xlowerwindow.patch b/pkgs/development/tcl-modules/by-name/ti/tix/duplicated-xlowerwindow.patch
similarity index 100%
rename from pkgs/development/libraries/tix/duplicated-xlowerwindow.patch
rename to pkgs/development/tcl-modules/by-name/ti/tix/duplicated-xlowerwindow.patch
diff --git a/pkgs/development/libraries/tix/fix-clang16.patch b/pkgs/development/tcl-modules/by-name/ti/tix/fix-clang16.patch
similarity index 100%
rename from pkgs/development/libraries/tix/fix-clang16.patch
rename to pkgs/development/tcl-modules/by-name/ti/tix/fix-clang16.patch
diff --git a/pkgs/development/libraries/tix/default.nix b/pkgs/development/tcl-modules/by-name/ti/tix/package.nix
similarity index 100%
rename from pkgs/development/libraries/tix/default.nix
rename to pkgs/development/tcl-modules/by-name/ti/tix/package.nix
diff --git a/pkgs/development/libraries/tkimg/default.nix b/pkgs/development/tcl-modules/by-name/tk/tkimg/package.nix
similarity index 100%
rename from pkgs/development/libraries/tkimg/default.nix
rename to pkgs/development/tcl-modules/by-name/tk/tkimg/package.nix
diff --git a/pkgs/development/libraries/wapp/default.nix b/pkgs/development/tcl-modules/by-name/wa/wapp/package.nix
similarity index 93%
rename from pkgs/development/libraries/wapp/default.nix
rename to pkgs/development/tcl-modules/by-name/wa/wapp/package.nix
index 9543b49af3b9..fc7e14205f9f 100644
--- a/pkgs/development/libraries/wapp/default.nix
+++ b/pkgs/development/tcl-modules/by-name/wa/wapp/package.nix
@@ -1,6 +1,6 @@
-{ lib, fetchurl, tcl }:
+{ lib, fetchurl, mkTclDerivation }:
 
-tcl.mkTclDerivation {
+mkTclDerivation {
   pname = "wapp";
   version = "0-unstable-2024-05-23";
 
diff --git a/pkgs/development/compilers/critcl/default.nix b/pkgs/development/tcl-modules/critcl/default.nix
similarity index 95%
rename from pkgs/development/compilers/critcl/default.nix
rename to pkgs/development/tcl-modules/critcl/default.nix
index 5caf63d9dba6..4dda4292eb64 100644
--- a/pkgs/development/compilers/critcl/default.nix
+++ b/pkgs/development/tcl-modules/critcl/default.nix
@@ -1,10 +1,11 @@
 { lib
 , fetchFromGitHub
+, mkTclDerivation
 , tcl
 , tcllib
 }:
 
-tcl.mkTclDerivation rec {
+mkTclDerivation rec {
   pname = "critcl";
   version = "3.2";
 
diff --git a/pkgs/development/tools/nagelfar/default.nix b/pkgs/development/tools/nagelfar/default.nix
index a40861e0988d..3e379875c4c5 100644
--- a/pkgs/development/tools/nagelfar/default.nix
+++ b/pkgs/development/tools/nagelfar/default.nix
@@ -1,4 +1,4 @@
-{ lib, fetchzip, tcl, tcllib, tk, }:
+{ lib, fetchzip, tcl, tclPackages, tk, }:
 
 tcl.mkTclDerivation {
   pname = "nagelfar";
@@ -11,7 +11,7 @@ tcl.mkTclDerivation {
 
   buildInputs = [
     tcl
-    tcllib
+    tclPackages.tcllib
     tk
   ];
 
diff --git a/pkgs/games/tcl2048/default.nix b/pkgs/games/tcl2048/default.nix
index c28c25958038..1435e1ed76e4 100644
--- a/pkgs/games/tcl2048/default.nix
+++ b/pkgs/games/tcl2048/default.nix
@@ -1,4 +1,4 @@
-{ lib, fetchurl, tcl, tcllib, runtimeShell }:
+{ lib, fetchurl, tcl, tclPackages, runtimeShell }:
 
 tcl.mkTclDerivation rec {
   pname = "tcl2048";
@@ -9,7 +9,7 @@ tcl.mkTclDerivation rec {
     sha256 = "53f5503efd7f029b2614b0f9b1e3aac6c0342735a3c9b811d74a5135fee3e89e";
   };
 
-  buildInputs = [ tcllib ];
+  buildInputs = [ tclPackages.tcllib ];
   dontUnpack = true;
 
   installPhase = ''
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 0bf4a938d95f..b5959ee8630f 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -152,6 +152,7 @@ mapAliases {
 
   inherit (libsForQt5.mauiPackages) buho; # added 2022-05-17
   butler = throw "butler was removed because it was broken and abandoned upstream"; # added 2024-06-18
+  bwidget = tclPackages.bwidget; # Added 2024-10-02
   # Shorter names; keep the longer name for back-compat. Added 2023-04-11
   buildFHSUserEnv = buildFHSEnv;
   buildFHSUserEnvChroot = buildFHSEnvChroot;
@@ -221,6 +222,7 @@ mapAliases {
   concurrencykit = throw "'concurrencykit' has been renamed to/replaced by 'libck'"; # Converted to throw 2024-10-17
   containerpilot = throw "'containerpilot' has been removed from nixpkgs, as it was broken and unmaintained"; # Added 2024-06-09
   crackmapexec = throw "'crackmapexec' has been removed as it was unmaintained. Use 'netexec' instead"; # 2024-08-11
+  critcl = tclPackages.critcl; # Added 2024-10-02
   cups-kyodialog3 = cups-kyodialog; # Added 2022-11-12
   cvs_fast_export = throw "'cvs_fast_export' has been renamed to/replaced by 'cvs-fast-export'"; # Converted to throw 2024-10-17
 
@@ -502,6 +504,7 @@ mapAliases {
   imagemagick7 = throw "'imagemagick7' has been renamed to/replaced by 'imagemagick'"; # Converted to throw 2024-10-17
   imagemagick7_light = throw "'imagemagick7_light' has been renamed to/replaced by 'imagemagick_light'"; # Converted to throw 2024-10-17
   immersed-vr = lib.warn "'immersed-vr' has been renamed to 'immersed'" immersed; # Added 2024-08-11
+  incrtcl = tclPackages.incrtcl; # Added 2024-10-02
   input-utils = throw "The input-utils package was dropped since it was unmaintained."; # Added 2024-06-21
   index-fm = libsForQt5.mauiPackages.index; # added 2022-05-17
   inotifyTools = inotify-tools;
@@ -515,6 +518,7 @@ mapAliases {
   isl_0_11 = throw "isl_0_11 has been removed from Nixpkgs, as it is unmaintained and obsolete"; # Added 2024-09-13
   isl_0_14 = throw "isl_0_14 has been removed from Nixpkgs, as it is unmaintained and obsolete"; # Added 2024-09-13
   iso-flags-png-320x420 = lib.warn "iso-flags-png-320x420 has been renamed to iso-flags-png-320x240" iso-flags-png-320x240; # Added 2024-07-17
+  itktcl = tclPackages.itktcl; # Added 2024-10-02
 
   ### J ###
 
@@ -766,6 +770,7 @@ mapAliases {
   mpg321 = throw "'mpg321' has been removed due to it being unmaintained by upstream. Consider using mpg123 instead."; # Added 2024-05-10
   msp430NewlibCross = msp430Newlib; # Added 2024-09-06
   mupdf_1_17 = throw "'mupdf_1_17' has been removed due to being outdated and insecure. Consider using 'mupdf' instead."; # Added 2024-08-22
+  mustache-tcl = tclPackages.mustache-tcl; # Added 2024-10-02
   mutt-with-sidebar = mutt; # Added 2022-09-17
   mysql-client = hiPrio mariadb.client;
   mysql = throw "'mysql' has been renamed to/replaced by 'mariadb'"; # Converted to throw 2024-10-17
@@ -886,6 +891,7 @@ mapAliases {
   patchelfStable = patchelf; # Added 2024-01-25
   pcsctools = pcsc-tools; # Added 2023-12-07
   pcsxr = throw "pcsxr was removed as it has been abandoned for over a decade; please use DuckStation, Mednafen, or the RetroArch PCSX ReARMed core"; # Added 2024-08-20
+  pdf4tcl = tclPackages.pdf4tcl; # Added 2024-10-02
   peach = asouldocs; # Added 2022-08-28
   percona-server_innovation = lib.warn "Percona upstream has decided to skip all Innovation releases of MySQL and only release LTS versions." percona-server; # Added 2024-10-13
   percona-server_lts = percona-server; # Added 2024-10-13
@@ -1124,7 +1130,16 @@ mapAliases {
   taplo-cli = taplo; # Added 2022-07-30
   taplo-lsp = taplo; # Added 2022-07-30
   taro = taproot-assets; # Added 2023-07-04
+  tcl-fcgi = tclPackages.tcl-fcgi; # Added 2024-10-02
+  tclcurl = tclPackages.tclcurl; # Added 2024-10-02
+  tcllib = tclPackages.tcllib; # Added 2024-10-02
+  tclmagick = tclPackages.tclmagick; # Added 2024-10-02
+  tcltls = tclPackages.tcltls; # Added 2024-10-02
+  tcludp = tclPackages.tcludp; # Added 2024-10-02
+  tclvfs = tclPackages.tclvfs; # Added 2024-10-02
+  tclx = tclPackages.tclx; # Added 2024-10-02
   tdesktop = telegram-desktop; # Added 2023-04-07
+  tdom = tclPackages.tdom; # Added 2024-10-02
   teck-programmer = throw "teck-programmer was removed because it was broken and unmaintained"; # added 2024-08-23
   teleport_13 = throw "teleport 13 has been removed as it is EOL. Please upgrade to Teleport 14 or later"; # Added 2024-05-26
   teleport_14 = throw "teleport 14 has been removed as it is EOL. Please upgrade to Teleport 15 or later"; # Added 2024-10-18
@@ -1141,7 +1156,9 @@ mapAliases {
   invalidateFetcherByDrvHash = testers.invalidateFetcherByDrvHash; # Added 2022-05-05
   timescale-prometheus = throw "'timescale-prometheus' has been renamed to/replaced by 'promscale'"; # Converted to throw 2024-10-17
   tightvnc = throw "'tightvnc' has been removed as the version 1.3 is not maintained upstream anymore and is insecure"; # Added 2024-08-22
+  tix = tclPackages.tix; # Added 2024-10-02
   tkcvs = tkrev; # Added 2022-03-07
+  tkimg = tclPackages.tkimg; # Added 2024-10-02
   toil = throw "toil was removed as it was broken and requires obsolete versions of libraries"; # Added 2024-09-22
   tokodon = plasma5Packages.tokodon;
   tokyo-night-gtk = tokyonight-gtk-theme; # Added 2024-01-28
@@ -1219,6 +1236,7 @@ mapAliases {
   ### W ###
   wakatime = wakatime-cli; # 2024-05-30
   wal_e = throw "wal_e was removed as it is unmaintained upstream and depends on the removed boto package; upstream recommends using wal-g or pgbackrest"; # Added 2024-09-22
+  wapp = tclPackages.wapp; # Added 2024-10-02
   wayfireApplications-unwrapped = throw ''
     'wayfireApplications-unwrapped.wayfire' has been renamed to/replaced by 'wayfire'
     'wayfireApplications-unwrapped.wayfirePlugins' has been renamed to/replaced by 'wayfirePlugins'
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 43ac381f7843..40194a8eef00 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7396,7 +7396,7 @@ with pkgs;
 
   extundelete = callPackage ../tools/filesystems/extundelete { };
 
-  expect = callPackage ../tools/misc/expect { };
+  expect = tclPackages.expect;
 
   expected-lite = callPackage ../development/libraries/expected-lite { };
 
@@ -14429,10 +14429,6 @@ with pkgs;
     inherit (darwin.apple_sdk.frameworks) CoreServices;
   };
 
-  critcl = callPackage ../development/compilers/critcl {
-    tcllib = tcllib.override { withCritcl = false; };
-  };
-
   inherit (darwin.apple_sdk_11_0.callPackage ../development/compilers/crystal { })
     crystal_1_2
     crystal_1_7
@@ -16617,7 +16613,7 @@ with pkgs;
   # We don't need versioned package sets thanks to the tcl stubs mechanism
   tclPackages = recurseIntoAttrs (callPackage ./tcl-packages.nix {});
 
-  tclreadline = callPackage ../development/interpreters/tclreadline { };
+  tclreadline = tclPackages.tclreadline;
 
   eltclsh = callPackage ../development/tools/eltclsh { };
 
@@ -18984,8 +18980,6 @@ with pkgs;
 
   bulletml = callPackage ../development/libraries/bulletml { };
 
-  bwidget = callPackage ../development/libraries/bwidget { };
-
   bzrtp = callPackage ../development/libraries/bzrtp { };
 
   c-ares = callPackage ../development/libraries/c-ares { };
@@ -20261,9 +20255,6 @@ with pkgs;
 
   ijs = callPackage ../development/libraries/ijs { };
 
-  itktcl  = callPackage ../development/libraries/itktcl { };
-  incrtcl = callPackage ../development/libraries/incrtcl { };
-
   indicator-application-gtk2 = callPackage ../development/libraries/indicator-application/gtk2.nix { };
   indicator-application-gtk3 = callPackage ../development/libraries/indicator-application/gtk3.nix { };
 
@@ -23202,14 +23193,6 @@ with pkgs;
 
   tclap_1_4 = callPackage ../development/libraries/tclap/1.4.nix { };
 
-  tcllib = callPackage ../development/libraries/tcllib { };
-
-  tcltls = callPackage ../development/libraries/tcltls { };
-
-  tclx = callPackage ../development/libraries/tclx { };
-
-  tcl-fcgi = callPackage ../development/libraries/tcl-fcgi { };
-
   tdb = callPackage ../development/libraries/tdb { };
 
   tdlib = callPackage ../development/libraries/tdlib { };
@@ -23258,16 +23241,12 @@ with pkgs;
 
   tivodecode = callPackage ../applications/video/tivodecode { };
 
-  tix = callPackage ../development/libraries/tix { };
-
   tk = tk-8_6;
 
   tk-9_0 = callPackage ../development/libraries/tk/9.0.nix { tcl = tcl-9_0; };
   tk-8_6 = callPackage ../development/libraries/tk/8.6.nix { };
   tk-8_5 = callPackage ../development/libraries/tk/8.5.nix { tcl = tcl-8_5; };
 
-  tkimg = callPackage ../development/libraries/tkimg { };
-
   tkrzw = callPackage ../development/libraries/tkrzw { };
 
   tl-expected = callPackage ../development/libraries/tl-expected { };
@@ -23437,8 +23416,6 @@ with pkgs;
 
   wangle = darwin.apple_sdk_11_0.callPackage ../development/libraries/wangle { };
 
-  wapp = callPackage ../development/libraries/wapp { };
-
   wavpack = callPackage ../development/libraries/wavpack { };
 
   wayland = darwin.apple_sdk_11_0.callPackage ../development/libraries/wayland { };
@@ -27301,8 +27278,6 @@ with pkgs;
 
   mustache-spec = callPackage ../data/documentation/mustache-spec { };
 
-  mustache-tcl = callPackage ../development/libraries/mustache-tcl { };
-
   mustache-go = callPackage ../development/tools/mustache-go { };
 
   mustache-hpp = callPackage ../development/libraries/mustache-hpp { };
diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index f1d40ccc835b..7e00010578e4 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -24089,9 +24089,9 @@ with self; {
       hash = "sha256-+DhYd6Sp7Z89OQPS0PfNcPrDzmgyxg9gCmghzuP7WHI=";
     };
     propagatedBuildInputs = [
-      pkgs.bwidget
+      pkgs.tclPackages.bwidget
       pkgs.tcl
-      pkgs.tix
+      pkgs.tclPackages.tix
       pkgs.tk
     ] ++ lib.optionals stdenv.hostPlatform.isDarwin [
       darwin.apple_sdk.frameworks.CoreServices ];
diff --git a/pkgs/top-level/tcl-packages.nix b/pkgs/top-level/tcl-packages.nix
index 2bb488b0710e..6be1844b4c36 100644
--- a/pkgs/top-level/tcl-packages.nix
+++ b/pkgs/top-level/tcl-packages.nix
@@ -14,5 +14,8 @@ lib.makeScope newScope (
     inherit tcl tk;
     inherit (tcl) mkTclDerivation tclPackageHook;
 
+    critcl = self.callPackage ../development/tcl-modules/critcl {
+      tcllib = self.tcllib.override { withCritcl = false; };
+    };
   })
 )