Free system for corporate file storage

Question

CRM

Prompt please any free system for storage of corporate files.

Primary requirements:

• Structured like a simple file system
• Access via web interface
• lightness
• Setting access rights to each directory for individual users or groups
• Open source and the ability to expand / finish

Would be a big plus:

• Versioning out of the box
• Various business modules (calendar for example)
• Automatic backup

Answer 1

Amahi
Contains ajaXplorer (file manager), ACE (online editor), iCalendar, etc. as optional modules.
In principle, you can see what is ported to Amahi and configure it separately from the office. sites