diff --git a/message-index/cabal/index.html b/message-index/cabal/index.html
new file mode 100644
index 00000000..40109ef5
--- /dev/null
+++ b/message-index/cabal/index.html
@@ -0,0 +1,27 @@
+---
+title: The Haskell Error Index | Cabal
+---
+
+<h2>Welcome</h2>
+
+<p>
+  This site describes error messages that can be returned by <a href="https://www.haskell.org/cabal/">Cabal</a>, including both errors and warnings.
+  Every error and warning has a code that Cabal emits when you run into it—you can look them up below.
+</p>
+
+<p>
+  So far, $messageCount$ Cabal errors and warnings are documented here.
+  If you encounter a message that is not yet documented, please
+  <a href="https://github.com/haskellfoundation/error-message-index/issues">open an issue</a> or
+  <a href="https://github.com/haskellfoundation/error-message-index/pulls">submit a pull request with documentation</a>.
+  Pull requests with additional examples and improved explanations for
+  existing messages are also very welcome, as are
+  <a href="https://github.com/haskellfoundation/error-message-index/issues?q=is%3Aissue+is%3Aopen+label%3Acss">improvements to the generated site</a>.
+</p>
+
+<p>
+This site is a project of <a href="https://haskell.foundation" target="_blank" rel="noopener noreferrer">The Haskell Foundation</a>.
+Please <a href="https://haskell.foundation/contact/" target="_blank" rel="noopener noreferrer">get in touch</a> if you have feedback or if you'd like to get involved!
+</p>
+
+$partial("templates/messages.html")$
diff --git a/message-index/ghc/index.html b/message-index/ghc/index.html
new file mode 100644
index 00000000..355b123b
--- /dev/null
+++ b/message-index/ghc/index.html
@@ -0,0 +1,27 @@
+---
+title: The Haskell Error Index | GHC
+---
+
+<h2>Welcome</h2>
+
+<p>
+  This site describes error messages that can be returned by <a href="https://www.haskell.org/ghc/">GHC</a>, including both errors and warnings.
+  Every error and warning has a code that GHC emits when you run into it—you can look them up below.
+</p>
+
+<p>
+  So far, $messageCount$ GHC errors and warnings are documented here.
+  If you encounter a message that is not yet documented, please
+  <a href="https://github.com/haskellfoundation/error-message-index/issues">open an issue</a> or
+  <a href="https://github.com/haskellfoundation/error-message-index/pulls">submit a pull request with documentation</a>.
+  Pull requests with additional examples and improved explanations for
+  existing messages are also very welcome, as are
+  <a href="https://github.com/haskellfoundation/error-message-index/issues?q=is%3Aissue+is%3Aopen+label%3Acss">improvements to the generated site</a>.
+</p>
+
+<p>
+This site is a project of <a href="https://haskell.foundation" target="_blank" rel="noopener noreferrer">The Haskell Foundation</a>.
+Please <a href="https://haskell.foundation/contact/" target="_blank" rel="noopener noreferrer">get in touch</a> if you have feedback or if you'd like to get involved!
+</p>
+
+$partial("templates/messages.html")$
diff --git a/message-index/ghcup/index.html b/message-index/ghcup/index.html
new file mode 100644
index 00000000..7820343d
--- /dev/null
+++ b/message-index/ghcup/index.html
@@ -0,0 +1,27 @@
+---
+title: The Haskell Error Index | GHCup
+---
+
+<h2>Welcome</h2>
+
+<p>
+  This site describes error messages that can be returned by <a href="https://www.haskell.org/ghcup/">GHCup</a>, including both errors and warnings.
+  Every error and warning has a code that GHCup emits when you run into it—you can look them up below.
+</p>
+
+<p>
+  So far, $messageCount$ GHCup errors and warnings are documented here.
+  If you encounter a message that is not yet documented, please
+  <a href="https://github.com/haskellfoundation/error-message-index/issues">open an issue</a> or
+  <a href="https://github.com/haskellfoundation/error-message-index/pulls">submit a pull request with documentation</a>.
+  Pull requests with additional examples and improved explanations for
+  existing messages are also very welcome, as are
+  <a href="https://github.com/haskellfoundation/error-message-index/issues?q=is%3Aissue+is%3Aopen+label%3Acss">improvements to the generated site</a>.
+</p>
+
+<p>
+This site is a project of <a href="https://haskell.foundation" target="_blank" rel="noopener noreferrer">The Haskell Foundation</a>.
+Please <a href="https://haskell.foundation/contact/" target="_blank" rel="noopener noreferrer">get in touch</a> if you have feedback or if you'd like to get involved!
+</p>
+
+$partial("templates/messages.html")$
diff --git a/message-index/index.html b/message-index/index.html
index 792ea64c..146623f3 100644
--- a/message-index/index.html
+++ b/message-index/index.html
@@ -11,13 +11,6 @@ <h2>Welcome</h2>
   These codes can be looked up below for further information.
 </p>
 
-<p>
-  Other Haskell-related tools are welcome to add their own messages to the index. Please contact
-  <a href="https://haskell.foundation/contact/" target="_blank" rel="noopener noreferrer">the Haskell Foundation</a>
-  or <a href="https://github.com/haskellfoundation/error-message-index/issues">open an issue</a>
-  to begin the process.
-</p>
-
 <p>
   So far, $messageCount$ errors and warnings are documented here.
   If you encounter a message that is not yet documented, please
@@ -34,42 +27,4 @@ <h2>Welcome</h2>
 Please <a href="https://haskell.foundation/contact/" target="_blank" rel="noopener noreferrer">get in touch</a> if you have feedback or if you'd like to get involved!
 </p>
 
-<h2>The Messages</h2>
-
-<script src="/js/tablefilter.js"></script>
-
-$partial("templates/message-list.html")$
-
-<script>
-var filtersConfig = {
-    base_path: '/wrong-on-purpose/',
-    auto_filter: {
-        delay: 75 //milliseconds
-    },
-    single_filter: true
-};
-var tf = new TableFilter(document.querySelector('.message-list'), filtersConfig);
-tf.init();
-
-var input = document.querySelector('.single_flt');
-
-if (input) {
-  input.setAttribute("placeholder", "🔍 Type here to filter ...");
-  input.focus();
-  
-  //Autofill the search from the URL 
-  let url = new URL(document.location.href);
-  let query = url.searchParams.get('q');
-  if(query !== null)
-  {
-    input.setAttribute('value',query)
-    //Move cursor to end
-    input.setSelectionRange(query.length,query.length);
-
-    //Make sure that the list gets filtered as if the query had been typed manually
-    input.dispatchEvent(new KeyboardEvent('keyup'));
-
-  }
-}
-
-</script>
+$partial("templates/messages.html")$
\ No newline at end of file
diff --git a/message-index/site.hs b/message-index/site.hs
index 422b059f..0f97e01c 100644
--- a/message-index/site.hs
+++ b/message-index/site.hs
@@ -119,23 +119,11 @@ main = hakyll $ do
         >>= applyAsTemplate ctx
         >>= loadAndApplyTemplate "templates/default.html" ctx
 
-  match "index.html" $ do
-    route idRoute
-    compile $ do
-      messages <- loadAll ("messages/*/index.md" .&&. hasNoVersion)
-      let bread = breadcrumbCtx []
-          indexCtx =
-            mconcat
-              [ listField "messages" (messageCtx <> defaultContext) (pure messages),
-                bread,
-                constField "messageCount" (show (length messages)),
-                defaultContext
-              ]
-
-      getResourceBody
-        >>= applyAsTemplate indexCtx
-        >>= loadAndApplyTemplate "templates/default.html" indexCtx
-        >>= relativizeUrls
+  match "index.html" $ compileFilteredIndex ""
+  match "cabal/index.html" $ compileFilteredIndex "Cabal-"
+  match "ghc/index.html" $ compileFilteredIndex "GHC-"
+  match "ghcup/index.html" $ compileFilteredIndex "GHCup-"
+  match "stack/index.html" $ compileFilteredIndex "S-"
 
   -- Needed for flagInfo below
   match "warning-sets/warning-sets-9.5.txt" $ do
@@ -185,6 +173,25 @@ main = hakyll $ do
 
 --------------------------------------------------------------------------------
 
+compileFilteredIndex :: String -> Rules ()
+compileFilteredIndex prefix = do
+  route idRoute
+  compile $ do
+    messages <- loadAll (fromGlob ("messages/" <> prefix <> "*/index.md") .&&. hasNoVersion )
+    let bread = breadcrumbCtx []
+        indexCtx =
+          mconcat
+            [ listField "messages" (messageCtx <> defaultContext) (pure messages),
+              bread,
+              constField "messageCount" (show (length messages)),
+              defaultContext
+            ]
+
+    getResourceBody
+      >>= applyAsTemplate indexCtx
+      >>= loadAndApplyTemplate "templates/default.html" indexCtx
+      >>= relativizeUrls
+
 -- | The file extensions to be shown in example lists
 exampleExtensions :: NonEmpty String
 exampleExtensions = "hs" :| ["yaml", "cabal"]
diff --git a/message-index/stack/index.html b/message-index/stack/index.html
new file mode 100644
index 00000000..792db5e6
--- /dev/null
+++ b/message-index/stack/index.html
@@ -0,0 +1,27 @@
+---
+title: The Haskell Error Index | Stack
+---
+
+<h2>Welcome</h2>
+
+<p>
+  This site describes error messages that can be returned by <a href="https://docs.haskellstack.org/en/stable/">Stack</a>, including both errors and warnings.
+  Every error and warning has a code that Stack emits when you run into it—you can look them up below.
+</p>
+
+<p>
+  So far, $messageCount$ Stack errors and warnings are documented here.
+  If you encounter a message that is not yet documented, please
+  <a href="https://github.com/haskellfoundation/error-message-index/issues">open an issue</a> or
+  <a href="https://github.com/haskellfoundation/error-message-index/pulls">submit a pull request with documentation</a>.
+  Pull requests with additional examples and improved explanations for
+  existing messages are also very welcome, as are
+  <a href="https://github.com/haskellfoundation/error-message-index/issues?q=is%3Aissue+is%3Aopen+label%3Acss">improvements to the generated site</a>.
+</p>
+
+<p>
+This site is a project of <a href="https://haskell.foundation" target="_blank" rel="noopener noreferrer">The Haskell Foundation</a>.
+Please <a href="https://haskell.foundation/contact/" target="_blank" rel="noopener noreferrer">get in touch</a> if you have feedback or if you'd like to get involved!
+</p>
+
+$partial("templates/messages.html")$
diff --git a/message-index/templates/messages.html b/message-index/templates/messages.html
index 1e4dc918..aaeba762 100644
--- a/message-index/templates/messages.html
+++ b/message-index/templates/messages.html
@@ -1,2 +1,39 @@
-$body$
+<h2>The Messages</h2>
+
+<script src="/js/tablefilter.js"></script>
+
 $partial("templates/message-list.html")$
+
+<script>
+var filtersConfig = {
+    base_path: '/wrong-on-purpose/',
+    auto_filter: {
+        delay: 75 //milliseconds
+    },
+    single_filter: true
+};
+var tf = new TableFilter(document.querySelector('.message-list'), filtersConfig);
+tf.init();
+
+var input = document.querySelector('.single_flt');
+
+if (input) {
+  input.setAttribute("placeholder", "🔍 Type here to filter ...");
+  input.focus();
+  
+  //Autofill the search from the URL 
+  let url = new URL(document.location.href);
+  let query = url.searchParams.get('q');
+  if(query !== null)
+  {
+    input.setAttribute('value',query)
+    //Move cursor to end
+    input.setSelectionRange(query.length,query.length);
+
+    //Make sure that the list gets filtered as if the query had been typed manually
+    input.dispatchEvent(new KeyboardEvent('keyup'));
+
+  }
+}
+
+</script>