diff --git a/note_kfet/admin.py b/note_kfet/admin.py
index 67ac872e..f128b237 100644
--- a/note_kfet/admin.py
+++ b/note_kfet/admin.py
@@ -1,6 +1,7 @@
 # Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+from django.conf import settings
 from django.contrib.admin import AdminSite
 from django.contrib.sites.admin import Site, SiteAdmin
 
@@ -23,3 +24,29 @@ class StrongAdminSite(AdminSite):
 # Instantiate admin site and register some defaults
 admin_site = StrongAdminSite()
 admin_site.register(Site, SiteAdmin)
+
+# Add external apps model
+if "django_htcpcp_tea" in settings.INSTALLED_APPS:
+    from django_htcpcp_tea.admin import *
+    from django_htcpcp_tea.models import *
+    admin_site.register(Pot, PotAdmin)
+    admin_site.register(TeaType, TeaTypeAdmin)
+    admin_site.register(Addition, AdditionAdmin)
+
+if "mailer" in settings.INSTALLED_APPS:
+    from mailer.admin import *
+    from mailer.models import *
+    admin_site.register(Message, MessageAdmin)
+    admin_site.register(DontSendEntry, DontSendEntryAdmin)
+    admin_site.register(MessageLog, MessageLogAdmin)
+
+if "rest_framework" in settings.INSTALLED_APPS:
+    from rest_framework.authtoken.admin import *
+    from rest_framework.authtoken.models import *
+    admin_site.register(Token, TokenAdmin)
+
+if "cas_server" in settings.INSTALLED_APPS:
+    from cas_server.admin import *
+    from cas_server.models import *
+    admin_site.register(ServicePattern, ServicePatternAdmin)
+    admin_site.register(FederatedIendityProvider, FederatedIendityProviderAdmin)