I am looking for a gallery I could integrate into my CMS. Zen Gallery is the least overloaded.
I would apreciate if the things a CMS does allready best could be handled as modules with an API to the core Zen photo. Candidates are:

• User Management (registration, login, password recovery
• Groups Management for defining rights
• FTP upload
  I am considering to write some functions myself but would need a setting where new versions do not require to rewrite all my additions.