Приложения в подкаталоге

Добавляем в начало settings.py:

import os
PROJECT_ROOT = os.path.abspath(os.path.dirname(__file__)) at_project_root = lambda name: os.path.join(PROJECT_ROOT, name)
sys.path.insert(1, PROJECT_ROOT)
for app_lookup_path in ('apps', 'externals',):
    sys.path.insert(1, at_project_root(app_lookup_path))