diff --git a/default.nix b/default.nix
index 75cd978..c97e9c9 100644
--- a/default.nix
+++ b/default.nix
@@ -9,4 +9,5 @@
       '';
   };
   shell = import ./shell.nix { inherit pkgs; };
+  providers = import ./providers.nix;
 }
diff --git a/providers.nix b/providers.nix
new file mode 100644
index 0000000..5642d6f
--- /dev/null
+++ b/providers.nix
@@ -0,0 +1,8 @@
+let
+  providers = {
+    klub-reseau = "nuage.beta.rz.ens.wtf";
+    eleves-ens = "cloud.eleves.ens.fr";
+    frama-agenda = "framagenda.org";
+  };
+in
+  builtins.mapAttrs (name: value: "https://${value}/remote.php/dav/public-calendars/") providers