bafkalender is a multilingual multi-section content management system in PHP and MySQLi. Access to the sections can be individually assigned for each user by the administrator. So far, I have created three applications for this CMS:
-bafreservation - reservations-platform for car-sharing or similar things. You can try this out at demo.bafweb.ch.
-bafclubmeet - registration list for regular meetings. This has been used by my volleyball club for more than a decade, without ever causing any problems.
-bafblog - backend administration for this blog.