diff --git a/canaille/__init__.py b/canaille/__init__.py
index e6ef0f59..2bdc96cb 100644
--- a/canaille/__init__.py
+++ b/canaille/__init__.py
@@ -115,16 +115,16 @@ def setup_themer(app):
 
 
 def setup_blueprints(app):
-    import canaille.account
-    import canaille.admin
-    import canaille.groups
+    import canaille.core.account
+    import canaille.core.admin
+    import canaille.core.groups
     import canaille.oidc.blueprints
 
     app.url_map.strict_slashes = False
 
-    app.register_blueprint(canaille.account.bp)
-    app.register_blueprint(canaille.admin.bp)
-    app.register_blueprint(canaille.groups.bp)
+    app.register_blueprint(canaille.core.account.bp)
+    app.register_blueprint(canaille.core.admin.bp)
+    app.register_blueprint(canaille.core.groups.bp)
     app.register_blueprint(canaille.oidc.blueprints.bp)
 
 
@@ -174,7 +174,7 @@ def create_app(config=None, validate=True):
     try:
         from .oidc.oauth import setup_oauth
         from .ldap_backend.backend import init_backend
-        from .i18n import setup_i18n
+        from .utils.i18n import setup_i18n
 
         setup_logging(app)
         init_backend(app)
diff --git a/canaille/commands.py b/canaille/commands.py
index 82dd3841..43cc859b 100644
--- a/canaille/commands.py
+++ b/canaille/commands.py
@@ -112,7 +112,7 @@ if HAS_FAKER:  # pragma: no branch
         Populate the database with generated random users.
         """
 
-        from canaille.populate import fake_users
+        from canaille.core.populate import fake_users
 
         fake_users(ctx.obj["number"])
 
@@ -130,6 +130,6 @@ if HAS_FAKER:  # pragma: no branch
         Populate the database with generated random groups.
         """
 
-        from canaille.populate import fake_groups
+        from canaille.core.populate import fake_groups
 
         fake_groups(ctx.obj["number"], nb_users_max)
diff --git a/canaille/core/__init__.py b/canaille/core/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/canaille/account.py b/canaille/core/account.py
similarity index 97%
rename from canaille/account.py
rename to canaille/core/account.py
index c603ec71..01a9c6f7 100644
--- a/canaille/account.py
+++ b/canaille/core/account.py
@@ -6,6 +6,18 @@ from typing import List
 
 import pkg_resources
 import wtforms
+from canaille.utils import b64_to_obj
+from canaille.utils import default_fields
+from canaille.utils import login_placeholder
+from canaille.utils import obj_to_b64
+from canaille.utils import profile_hash
+from canaille.utils.flask import current_user
+from canaille.utils.flask import permissions_needed
+from canaille.utils.flask import render_htmx_template
+from canaille.utils.flask import request_is_htmx
+from canaille.utils.flask import smtp_needed
+from canaille.utils.flask import user_needed
+from canaille.utils.forms import TableForm
 from flask import abort
 from flask import Blueprint
 from flask import current_app
@@ -33,18 +45,6 @@ from .mails import send_password_initialization_mail
 from .mails import send_password_reset_mail
 from .models import Group
 from .models import User
-from .utils import b64_to_obj
-from .utils import default_fields
-from .utils import login_placeholder
-from .utils import obj_to_b64
-from .utils import profile_hash
-from .utils.flask import current_user
-from .utils.flask import permissions_needed
-from .utils.flask import render_htmx_template
-from .utils.flask import request_is_htmx
-from .utils.flask import smtp_needed
-from .utils.flask import user_needed
-from .utils.forms import TableForm
 
 
 bp = Blueprint("account", __name__)
diff --git a/canaille/admin.py b/canaille/core/admin.py
similarity index 98%
rename from canaille/admin.py
rename to canaille/core/admin.py
index aca843a2..2e5cbdb6 100644
--- a/canaille/admin.py
+++ b/canaille/core/admin.py
@@ -1,5 +1,5 @@
-from canaille.mails import profile_hash
-from canaille.mails import send_test_mail
+from canaille.core.mails import profile_hash
+from canaille.core.mails import send_test_mail
 from canaille.utils import obj_to_b64
 from canaille.utils.flask import permissions_needed
 from canaille.utils.forms import HTMXForm
diff --git a/canaille/forms.py b/canaille/core/forms.py
similarity index 98%
rename from canaille/forms.py
rename to canaille/core/forms.py
index 181c7e72..faacf1c1 100644
--- a/canaille/forms.py
+++ b/canaille/core/forms.py
@@ -1,16 +1,16 @@
 import wtforms.form
+from canaille.utils.forms import HTMXBaseForm
+from canaille.utils.forms import HTMXForm
+from canaille.utils.forms import is_uri
+from canaille.utils.i18n import native_language_name_from_code
 from flask import current_app
 from flask import g
 from flask_babel import lazy_gettext as _
 from flask_wtf.file import FileAllowed
 from flask_wtf.file import FileField
 
-from .i18n import native_language_name_from_code
 from .models import Group
 from .models import User
-from .utils.forms import HTMXBaseForm
-from .utils.forms import HTMXForm
-from .utils.forms import is_uri
 
 
 def unique_login(form, field):
diff --git a/canaille/groups.py b/canaille/core/groups.py
similarity index 95%
rename from canaille/groups.py
rename to canaille/core/groups.py
index d468314d..e871bd22 100644
--- a/canaille/groups.py
+++ b/canaille/core/groups.py
@@ -1,3 +1,6 @@
+from canaille.utils.flask import permissions_needed
+from canaille.utils.flask import render_htmx_template
+from canaille.utils.forms import TableForm
 from flask import abort
 from flask import Blueprint
 from flask import flash
@@ -11,9 +14,6 @@ from .forms import CreateGroupForm
 from .forms import EditGroupForm
 from .models import Group
 from .models import User
-from .utils.flask import permissions_needed
-from .utils.flask import render_htmx_template
-from .utils.forms import TableForm
 
 bp = Blueprint("groups", __name__, url_prefix="/groups")
 
diff --git a/canaille/mails.py b/canaille/core/mails.py
similarity index 99%
rename from canaille/mails.py
rename to canaille/core/mails.py
index 1568cbb1..c5414f12 100644
--- a/canaille/mails.py
+++ b/canaille/core/mails.py
@@ -1,3 +1,4 @@
+from canaille.utils import profile_hash
 from canaille.utils.mails import logo
 from canaille.utils.mails import send_email
 from flask import current_app
@@ -5,8 +6,6 @@ from flask import url_for
 from flask_babel import gettext as _
 from flask_themer import render_template
 
-from .utils import profile_hash
-
 
 def send_test_mail(email):
     base_url = url_for("account.index", _external=True)
diff --git a/canaille/models.py b/canaille/core/models.py
similarity index 99%
rename from canaille/models.py
rename to canaille/core/models.py
index 0e79ed4d..da46538d 100644
--- a/canaille/models.py
+++ b/canaille/core/models.py
@@ -1,9 +1,8 @@
 import ldap.filter
+from canaille.ldap_backend.ldapobject import LDAPObject
 from flask import current_app
 from flask import session
 
-from .ldap_backend.ldapobject import LDAPObject
-
 
 class User(LDAPObject):
     DEFAULT_OBJECT_CLASS = "inetOrgPerson"
diff --git a/canaille/populate.py b/canaille/core/populate.py
similarity index 93%
rename from canaille/populate.py
rename to canaille/core/populate.py
index daa6b8f9..984e0304 100644
--- a/canaille/populate.py
+++ b/canaille/core/populate.py
@@ -2,9 +2,9 @@ import random
 
 import faker
 import ldap
-from canaille.i18n import available_language_codes
-from canaille.models import Group
-from canaille.models import User
+from canaille.core.models import Group
+from canaille.core.models import User
+from canaille.utils.i18n import available_language_codes
 from faker.config import AVAILABLE_LOCALES
 
 
diff --git a/canaille/ldap_backend/backend.py b/canaille/ldap_backend/backend.py
index fd87a84e..05a2ac2f 100644
--- a/canaille/ldap_backend/backend.py
+++ b/canaille/ldap_backend/backend.py
@@ -11,8 +11,8 @@ from flask_babel import gettext as _
 
 def setup_ldap_models(config):
     from .ldapobject import LDAPObject
-    from ..models import Group
-    from ..models import User
+    from canaille.core.models import Group
+    from canaille.core.models import User
 
     LDAPObject.root_dn = config["LDAP"]["ROOT_DN"]
 
@@ -112,7 +112,8 @@ def init_backend(app):
 
 
 def validate_configuration(config):
-    from canaille.models import User, Group
+    from canaille.core.models import Group
+    from canaille.core.models import User
 
     try:
         conn = ldap.initialize(config["LDAP"]["URI"])
diff --git a/canaille/oidc/endpoints.py b/canaille/oidc/endpoints.py
index 0e22d065..68503cb3 100644
--- a/canaille/oidc/endpoints.py
+++ b/canaille/oidc/endpoints.py
@@ -6,6 +6,8 @@ from authlib.jose import JsonWebKey
 from authlib.jose import jwt
 from authlib.oauth2 import OAuth2Error
 from canaille import csrf
+from canaille.core.forms import FullLoginForm
+from canaille.core.models import User
 from flask import abort
 from flask import Blueprint
 from flask import current_app
@@ -19,8 +21,6 @@ from flask_babel import gettext as _
 from flask_themer import render_template
 from werkzeug.datastructures import CombinedMultiDict
 
-from ..forms import FullLoginForm
-from ..models import User
 from ..utils.flask import current_user
 from ..utils.flask import set_parameter_in_url_query
 from .forms import AuthorizeForm
diff --git a/canaille/oidc/oauth.py b/canaille/oidc/oauth.py
index 634db4ce..25421ec5 100644
--- a/canaille/oidc/oauth.py
+++ b/canaille/oidc/oauth.py
@@ -26,11 +26,11 @@ from authlib.oidc.core.grants import OpenIDCode as _OpenIDCode
 from authlib.oidc.core.grants import OpenIDHybridGrant as _OpenIDHybridGrant
 from authlib.oidc.core.grants import OpenIDImplicitGrant as _OpenIDImplicitGrant
 from authlib.oidc.core.grants.util import generate_id_token
+from canaille.core.models import User
 from flask import current_app
 from flask import request
 from werkzeug.security import gen_salt
 
-from ..models import User
 from .models import AuthorizationCode
 from .models import Client
 from .models import Token
diff --git a/canaille/utils/__init__.py b/canaille/utils/__init__.py
index 27a1ff0e..e127c52b 100644
--- a/canaille/utils/__init__.py
+++ b/canaille/utils/__init__.py
@@ -3,7 +3,7 @@ import hashlib
 import json
 import re
 
-from canaille.models import User
+from canaille.core.models import User
 from flask import current_app
 from flask import request
 from flask_babel import gettext as _
diff --git a/canaille/utils/flask.py b/canaille/utils/flask.py
index fdf31a3f..6b832ada 100644
--- a/canaille/utils/flask.py
+++ b/canaille/utils/flask.py
@@ -3,7 +3,7 @@ from functools import wraps
 from urllib.parse import urlsplit
 from urllib.parse import urlunsplit
 
-from canaille.models import User
+from canaille.core.models import User
 from flask import abort
 from flask import current_app
 from flask import render_template
diff --git a/canaille/utils/forms.py b/canaille/utils/forms.py
index f80f0b1e..7891cd57 100644
--- a/canaille/utils/forms.py
+++ b/canaille/utils/forms.py
@@ -1,8 +1,8 @@
 import math
 
 import wtforms
-from canaille.i18n import DEFAULT_LANGUAGE_CODE
-from canaille.i18n import locale_selector
+from canaille.utils.i18n import DEFAULT_LANGUAGE_CODE
+from canaille.utils.i18n import locale_selector
 from flask import abort
 from flask import current_app
 from flask import make_response
diff --git a/canaille/i18n.py b/canaille/utils/i18n.py
similarity index 97%
rename from canaille/i18n.py
rename to canaille/utils/i18n.py
index 1b09e40d..5f945ce6 100644
--- a/canaille/i18n.py
+++ b/canaille/utils/i18n.py
@@ -27,7 +27,7 @@ def setup_i18n(app):
 
 
 def locale_selector():
-    from .utils.flask import current_user
+    from .flask import current_user
 
     user = current_user()
     available_language_codes = getattr(g, "available_language_codes", [])
diff --git a/tests/commands/test_populate.py b/tests/commands/test_populate.py
index 69b03e8f..49ac69d8 100644
--- a/tests/commands/test_populate.py
+++ b/tests/commands/test_populate.py
@@ -1,7 +1,7 @@
 from canaille.commands import cli
-from canaille.models import Group
-from canaille.models import User
-from canaille.populate import fake_users
+from canaille.core.models import Group
+from canaille.core.models import User
+from canaille.core.populate import fake_users
 
 
 def test_populate_users(testclient, slapd_connection):
diff --git a/tests/conftest.py b/tests/conftest.py
index 62dda704..3402878e 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -2,9 +2,9 @@ import ldap.ldapobject
 import pytest
 import slapd
 from canaille import create_app
+from canaille.core.models import Group
+from canaille.core.models import User
 from canaille.ldap_backend.backend import setup_ldap_models
-from canaille.models import Group
-from canaille.models import User
 from canaille.oidc.installation import setup_ldap_tree
 from flask import g
 from flask_webtest import TestApp
diff --git a/tests/core/__init__.py b/tests/core/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/test_about.py b/tests/core/test_about.py
similarity index 100%
rename from tests/test_about.py
rename to tests/core/test_about.py
diff --git a/tests/test_account.py b/tests/core/test_account.py
similarity index 99%
rename from tests/test_account.py
rename to tests/core/test_account.py
index 1fb09350..d31c89b8 100644
--- a/tests/test_account.py
+++ b/tests/core/test_account.py
@@ -1,6 +1,6 @@
 from unittest import mock
 
-from canaille.models import User
+from canaille.core.models import User
 
 
 def test_index(testclient, user):
diff --git a/tests/test_forgotten_password.py b/tests/core/test_forgotten_password.py
similarity index 100%
rename from tests/test_forgotten_password.py
rename to tests/core/test_forgotten_password.py
diff --git a/tests/test_groups.py b/tests/core/test_groups.py
similarity index 97%
rename from tests/test_groups.py
rename to tests/core/test_groups.py
index 8d676b9e..ad206fcb 100644
--- a/tests/test_groups.py
+++ b/tests/core/test_groups.py
@@ -1,7 +1,7 @@
-from canaille.models import Group
-from canaille.models import User
-from canaille.populate import fake_groups
-from canaille.populate import fake_users
+from canaille.core.models import Group
+from canaille.core.models import User
+from canaille.core.populate import fake_groups
+from canaille.core.populate import fake_users
 
 
 def test_no_group(app, slapd_connection):
diff --git a/tests/test_invitation.py b/tests/core/test_invitation.py
similarity index 99%
rename from tests/test_invitation.py
rename to tests/core/test_invitation.py
index ff9358c6..730982b2 100644
--- a/tests/test_invitation.py
+++ b/tests/core/test_invitation.py
@@ -1,7 +1,7 @@
 import datetime
 
-from canaille.account import Invitation
-from canaille.models import User
+from canaille.core.account import Invitation
+from canaille.core.models import User
 
 
 def test_invitation(testclient, logged_admin, foo_group, smtpd):
diff --git a/tests/test_password_reset.py b/tests/core/test_password_reset.py
similarity index 97%
rename from tests/test_password_reset.py
rename to tests/core/test_password_reset.py
index 0272684a..a459c9b0 100644
--- a/tests/test_password_reset.py
+++ b/tests/core/test_password_reset.py
@@ -1,4 +1,4 @@
-from canaille.account import profile_hash
+from canaille.core.account import profile_hash
 
 
 def test_password_reset(testclient, user):
diff --git a/tests/test_profile_creation.py b/tests/core/test_profile_creation.py
similarity index 99%
rename from tests/test_profile_creation.py
rename to tests/core/test_profile_creation.py
index 1f59c328..8bca6e15 100644
--- a/tests/test_profile_creation.py
+++ b/tests/core/test_profile_creation.py
@@ -1,4 +1,4 @@
-from canaille.models import User
+from canaille.core.models import User
 
 
 def test_user_creation_edition_and_deletion(
diff --git a/tests/test_profile_edition.py b/tests/core/test_profile_edition.py
similarity index 99%
rename from tests/test_profile_edition.py
rename to tests/core/test_profile_edition.py
index 4eec077d..ad4cfe6e 100644
--- a/tests/test_profile_edition.py
+++ b/tests/core/test_profile_edition.py
@@ -1,4 +1,4 @@
-from canaille.populate import fake_users
+from canaille.core.populate import fake_users
 from webtest import Upload
 
 
diff --git a/tests/test_profile_photo.py b/tests/core/test_profile_photo.py
similarity index 99%
rename from tests/test_profile_photo.py
rename to tests/core/test_profile_photo.py
index b7111be9..cce7b6bd 100644
--- a/tests/test_profile_photo.py
+++ b/tests/core/test_profile_photo.py
@@ -1,6 +1,6 @@
 import datetime
 
-from canaille.models import User
+from canaille.core.models import User
 from webtest import Upload
 
 
diff --git a/tests/test_profile_settings.py b/tests/core/test_profile_settings.py
similarity index 99%
rename from tests/test_profile_settings.py
rename to tests/core/test_profile_settings.py
index df5f4bb4..c20517bb 100644
--- a/tests/test_profile_settings.py
+++ b/tests/core/test_profile_settings.py
@@ -1,6 +1,6 @@
 from unittest import mock
 
-from canaille.models import User
+from canaille.core.models import User
 
 
 def test_edition(
diff --git a/tests/ldap/test_utils.py b/tests/ldap/test_utils.py
index 9baf3ecd..a57a732d 100644
--- a/tests/ldap/test_utils.py
+++ b/tests/ldap/test_utils.py
@@ -1,14 +1,14 @@
 import datetime
 
 import ldap.dn
+from canaille.core.models import Group
+from canaille.core.models import User
 from canaille.ldap_backend.backend import setup_ldap_models
 from canaille.ldap_backend.ldapobject import LDAPObject
 from canaille.ldap_backend.ldapobject import python_attrs_to_ldap
 from canaille.ldap_backend.utils import ldap_to_python
 from canaille.ldap_backend.utils import python_to_ldap
 from canaille.ldap_backend.utils import Syntax
-from canaille.models import Group
-from canaille.models import User
 
 
 def test_object_creation(slapd_connection):
diff --git a/tests/oidc/test_authorization_code_flow.py b/tests/oidc/test_authorization_code_flow.py
index fabf8b1d..017a9c19 100644
--- a/tests/oidc/test_authorization_code_flow.py
+++ b/tests/oidc/test_authorization_code_flow.py
@@ -5,7 +5,7 @@ from urllib.parse import urlsplit
 import freezegun
 from authlib.jose import jwt
 from authlib.oauth2.rfc7636 import create_s256_code_challenge
-from canaille.models import User
+from canaille.core.models import User
 from canaille.oidc.models import AuthorizationCode
 from canaille.oidc.models import Consent
 from canaille.oidc.models import Token
diff --git a/tests/test_configuration.py b/tests/test_configuration.py
index 32938ed8..5ad554da 100644
--- a/tests/test_configuration.py
+++ b/tests/test_configuration.py
@@ -36,7 +36,7 @@ def test_ldap_connection_remote_ldap_wrong_credentials(testclient, configuration
 
 
 def test_ldap_cannot_create_users(testclient, configuration, slapd_connection):
-    from canaille.models import User
+    from canaille.core.models import User
 
     def fake_init(*args, **kwarg):
         raise ldap.INSUFFICIENT_ACCESS
@@ -50,7 +50,7 @@ def test_ldap_cannot_create_users(testclient, configuration, slapd_connection):
 
 
 def test_ldap_cannot_create_groups(testclient, configuration, slapd_connection):
-    from canaille.models import Group
+    from canaille.core.models import Group
 
     def fake_init(*args, **kwarg):
         raise ldap.INSUFFICIENT_ACCESS
diff --git a/tests/utils/__init__.py b/tests/utils/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/test_apputils.py b/tests/utils/test_apputils.py
similarity index 100%
rename from tests/test_apputils.py
rename to tests/utils/test_apputils.py
diff --git a/tests/test_flaskutils.py b/tests/utils/test_flaskutils.py
similarity index 100%
rename from tests/test_flaskutils.py
rename to tests/utils/test_flaskutils.py