diff --git a/pkgs/applications/science/electronics/geda/default.nix b/pkgs/applications/science/electronics/geda/default.nix
index 8ed37c9b4b3c..8efcbd3bae83 100644
--- a/pkgs/applications/science/electronics/geda/default.nix
+++ b/pkgs/applications/science/electronics/geda/default.nix
@@ -50,7 +50,7 @@ stdenv.mkDerivation rec {
 
   meta = with lib; {
     description = "Full GPL'd suite of Electronic Design Automation tools";
-    homepage = "http://www.geda-project.org/";
+    homepage = "https://geda.sourceforge.net/";
     maintainers = with maintainers; [ pjones ];
     platforms = platforms.linux;
     license = licenses.gpl2;
diff --git a/pkgs/applications/science/machine-learning/openbugs/default.nix b/pkgs/applications/science/machine-learning/openbugs/default.nix
index 926188b41815..52055a7b32e3 100644
--- a/pkgs/applications/science/machine-learning/openbugs/default.nix
+++ b/pkgs/applications/science/machine-learning/openbugs/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
 
   meta = with lib; {
     description = "Software package for performing Bayesian analysis and simulation using Markov Chain Monte Carlo";
-    homepage = "https://www.mrc-bsu.cam.ac.uk/software/bugs/openbugs/";
+    homepage = "https://github.com/jsta/openbugs/";
     changelog = "https://github.com/jsta/openbugs/blob/master/ChangeLog";
     platforms = [ "i686-linux" "x86_64-linux" ];
     license = licenses.gpl3Only;
diff --git a/pkgs/applications/window-managers/ion-3/default.nix b/pkgs/applications/window-managers/ion-3/default.nix
index 3ab12933a18b..451e243b163b 100644
--- a/pkgs/applications/window-managers/ion-3/default.nix
+++ b/pkgs/applications/window-managers/ion-3/default.nix
@@ -45,7 +45,7 @@ stdenv.mkDerivation rec {
 
   meta = with lib; {
     description = "Tiling tabbed window manager designed with keyboard users in mind";
-    homepage = "https://modeemi.fi/~tuomov/ion";
+    homepage = "https://tuomov.iki.fi/software/ion/";
     platforms = with platforms; linux;
     license = licenses.lgpl21;
     maintainers = [ ];
diff --git a/pkgs/by-name/bt/btar/package.nix b/pkgs/by-name/bt/btar/package.nix
index 9c92464bf481..2109d92ab884 100644
--- a/pkgs/by-name/bt/btar/package.nix
+++ b/pkgs/by-name/bt/btar/package.nix
@@ -36,7 +36,7 @@ stdenv.mkDerivation rec {
     description = "Tar-compatible block-based archiver";
     mainProgram = "btar";
     license = lib.licenses.gpl3Plus;
-    homepage = "https://viric.name/cgi-bin/btar";
+    homepage = "https://briantracy.xyz/writing/btar.html";
     platforms = platforms.all;
     maintainers = [ ];
   };
diff --git a/pkgs/by-name/gs/gsoap/package.nix b/pkgs/by-name/gs/gsoap/package.nix
index 27bdec91f290..ece6659ddc4b 100644
--- a/pkgs/by-name/gs/gsoap/package.nix
+++ b/pkgs/by-name/gs/gsoap/package.nix
@@ -53,7 +53,7 @@ stdenv.mkDerivation rec {
 
   meta = with lib; {
     description = "C/C++ toolkit for SOAP web services and XML-based applications";
-    homepage = "http://www.cs.fsu.edu/~engelen/soap.html";
+    homepage = "https://www.genivia.com/products.html";
     # gsoap is dual/triple licensed (see homepage for details):
     # 1. gSOAP Public License 1.3 (based on Mozilla Public License 1.1).
     #    Components NOT covered by the gSOAP Public License are:
diff --git a/pkgs/by-name/nu/nullidentdmod/package.nix b/pkgs/by-name/nu/nullidentdmod/package.nix
index 347319f6016c..fb7782df00ee 100644
--- a/pkgs/by-name/nu/nullidentdmod/package.nix
+++ b/pkgs/by-name/nu/nullidentdmod/package.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
   version = "1.3";
 
   src = fetchFromGitHub {
-    owner = "Acidhub";
+    owner = "Ranthrall";
     repo = "nullidentdmod";
     rev = "v${version}";
     sha256 = "1ahwm5pyidc6m07rh5ls2lc25kafrj233nnbcybprgl7bqdq1b0k";
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
     description = "Simple identd that just replies with a random string or customized userid";
     mainProgram = "nullidentdmod";
     license = licenses.gpl2Plus;
-    homepage = "http://acidhub.click/NullidentdMod";
+    homepage = "https://github.com/Ranthrall/nullidentdmod";
     maintainers = with maintainers; [ das_j ];
     platforms = platforms.linux; # Must be run by systemd
   };
diff --git a/pkgs/by-name/pa/parmetis/package.nix b/pkgs/by-name/pa/parmetis/package.nix
index a2289eea3069..8419e81b19f5 100644
--- a/pkgs/by-name/pa/parmetis/package.nix
+++ b/pkgs/by-name/pa/parmetis/package.nix
@@ -38,7 +38,7 @@ stdenv.mkDerivation {
       recursive-bisection, multilevel k-way, and multi-constraint partitioning
       schemes
     '';
-    homepage = "http://glaros.dtc.umn.edu/gkhome/metis/parmetis/overview";
+    homepage = "https://github.com/KarypisLab/ParMETIS";
     platforms = platforms.all;
     license = licenses.unfree;
     maintainers = [ maintainers.costrouc ];
diff --git a/pkgs/by-name/pc/pcb/package.nix b/pkgs/by-name/pc/pcb/package.nix
index 1dd1be7f912a..e81c92f9cd56 100644
--- a/pkgs/by-name/pc/pcb/package.nix
+++ b/pkgs/by-name/pc/pcb/package.nix
@@ -62,7 +62,7 @@ stdenv.mkDerivation rec {
 
   meta = with lib; {
     description = "Printed Circuit Board editor";
-    homepage = "http://pcb.geda-project.org/";
+    homepage = "https://sourceforge.net/projects/pcb/";
     maintainers = with maintainers; [ mog ];
     platforms = platforms.linux;
     license = licenses.gpl2;
diff --git a/pkgs/by-name/te/terra-station/package.nix b/pkgs/by-name/te/terra-station/package.nix
index 7cfc3a97e3d9..9cc16d1e198f 100644
--- a/pkgs/by-name/te/terra-station/package.nix
+++ b/pkgs/by-name/te/terra-station/package.nix
@@ -73,7 +73,7 @@ stdenv.mkDerivation rec {
 
   meta = with lib; {
     description = "Terra station is the official wallet of the Terra blockchain";
-    homepage = "https://docs.terra.money/docs/learn/terra-station/README.html";
+    homepage = "https://station.money/";
     license = licenses.isc;
     maintainers = [ maintainers.peterwilli ];
     platforms = [ "x86_64-linux" ];
diff --git a/pkgs/by-name/zc/zchaff/package.nix b/pkgs/by-name/zc/zchaff/package.nix
index 4e486c5a9512..c0ffc52641da 100644
--- a/pkgs/by-name/zc/zchaff/package.nix
+++ b/pkgs/by-name/zc/zchaff/package.nix
@@ -26,7 +26,7 @@ clangStdenv.mkDerivation rec {
   '';
 
   meta = with lib; {
-    homepage = "https://www.princeton.edu/~chaff/zchaf";
+    homepage = "https://www.princeton.edu/~chaff/zchaff.html";
     description = "Accelerated SAT Solver from Princeton";
     mainProgram = "zchaff";
     license = licenses.mit;
diff --git a/pkgs/development/ocaml-modules/cil/default.nix b/pkgs/development/ocaml-modules/cil/default.nix
index 73e37f9281bc..da1c0aa10c2b 100644
--- a/pkgs/development/ocaml-modules/cil/default.nix
+++ b/pkgs/development/ocaml-modules/cil/default.nix
@@ -39,7 +39,7 @@ else
     prefixKey = "-prefix=";
 
     meta = with lib; {
-      homepage = "http://kerneis.github.io/cil/";
+      homepage = "https://sourceforge.net/projects/cil/";
       description = "Front-end for the C programming language that facilitates program analysis and transformation";
       license = licenses.bsd3;
       maintainers = [ maintainers.vbgl ];
diff --git a/pkgs/development/python-modules/gym/default.nix b/pkgs/development/python-modules/gym/default.nix
index 69165286ba00..a2951074a122 100644
--- a/pkgs/development/python-modules/gym/default.nix
+++ b/pkgs/development/python-modules/gym/default.nix
@@ -34,7 +34,7 @@ buildPythonPackage rec {
 
   meta = with lib; {
     description = "Toolkit for developing and comparing your reinforcement learning agents";
-    homepage = "https://gym.openai.com/";
+    homepage = "https://www.gymlibrary.dev/";
     license = licenses.mit;
     maintainers = with maintainers; [ hyphon81 ];
   };
diff --git a/pkgs/development/python-modules/llama-index-legacy/default.nix b/pkgs/development/python-modules/llama-index-legacy/default.nix
index 43e13c7cedeb..06d32b341bcd 100644
--- a/pkgs/development/python-modules/llama-index-legacy/default.nix
+++ b/pkgs/development/python-modules/llama-index-legacy/default.nix
@@ -31,7 +31,7 @@ buildPythonPackage rec {
 
   meta = with lib; {
     description = "LlamaIndex Readers Integration for files";
-    homepage = "https://github.com/run-llama/llama_index/tree/main/llama-index-legacy";
+    homepage = "https://github.com/run-llama/llama_index/tree/v0.9.48";
     license = licenses.mit;
     maintainers = with maintainers; [ fab ];
   };
diff --git a/pkgs/development/python-modules/permissionedforms/default.nix b/pkgs/development/python-modules/permissionedforms/default.nix
index 8abf3f5abf99..053786250673 100644
--- a/pkgs/development/python-modules/permissionedforms/default.nix
+++ b/pkgs/development/python-modules/permissionedforms/default.nix
@@ -31,8 +31,8 @@ buildPythonPackage rec {
 
   meta = with lib; {
     description = "Django extension for creating forms that vary according to user permissions";
-    homepage = "https://github.com/wagtail/permissionedforms";
-    changelog = "https://github.com/wagtail/permissionedforms/blob/v${version}/CHANGELOG.md";
+    homepage = "https://github.com/wagtail/django-permissionedforms";
+    changelog = "https://github.com/wagtail/django-permissionedforms/blob/v${version}/CHANGELOG.md";
     license = licenses.bsd3;
     maintainers = with maintainers; [ sephi ];
   };
diff --git a/pkgs/development/python-modules/should-dsl/default.nix b/pkgs/development/python-modules/should-dsl/default.nix
index 5ff8faa1b862..1760ed454397 100644
--- a/pkgs/development/python-modules/should-dsl/default.nix
+++ b/pkgs/development/python-modules/should-dsl/default.nix
@@ -20,7 +20,7 @@ buildPythonPackage rec {
 
   meta = with lib; {
     description = "Should assertions in Python as clear and readable as possible";
-    homepage = "http://www.should-dsl.info/";
+    homepage = "https://github.com/nsi-iff/should-dsl";
     license = licenses.mit;
     maintainers = with maintainers; [ jluttine ];
   };
diff --git a/pkgs/tools/graphics/nifskope/default.nix b/pkgs/tools/graphics/nifskope/default.nix
index 609c75e6c1c8..26e0d03540b9 100644
--- a/pkgs/tools/graphics/nifskope/default.nix
+++ b/pkgs/tools/graphics/nifskope/default.nix
@@ -75,7 +75,7 @@ stdenv.mkDerivation {
   '';
 
   meta = with lib; {
-    homepage = "https://niftools.sourceforge.net/wiki/NifSkope";
+    homepage = "https://github.com/niftools/nifskope";
     description = "Tool for analyzing and editing NetImmerse/Gamebryo '*.nif' files";
     maintainers = [ ];
     platforms = platforms.linux;