1 - PostNuke itself does just that, it is a core user's database system with multilingual support and theme management for display and formatting. all the rest is considered modules. It handles user authentication, permissions and since recently. Modules tie into the system for authentication display etc. A number of modules come with it, a (HUGE) number is available to add on easily. It is fairly simple to create a new module (or better yet modify an existing one) with some knowledge of PHP and some research on the PN API and modules devel docs (Unfortunately still scattered around too much to call easy to find).
NOW,
2- For what you're talking about (just sharing files with file/folder user/group permission) they did make it: it's called linux! and the front end of it is FTP!! (of which there is web based clients available by the dozens)
I do think I might be misunderstanding "content management"
2 notes:
1 - PostNuke itself does just that, it is a core user's database system with multilingual support and theme management for display and formatting. all the rest is considered modules. It handles user authentication, permissions and since recently. Modules tie into the system for authentication display etc. A number of modules come with it, a (HUGE) number is available to add on easily. It is fairly simple to create a new module (or better yet modify an existing one) with some knowledge of PHP and some research on the PN API and modules devel docs (Unfortunately still scattered around too much to call easy to find).
NOW,
2- For what you're talking about (just sharing files with file/folder user/group permission) they did make it: it's called linux! and the front end of it is FTP!! (of which there is web based clients available by the dozens)
I do think I might be misunderstanding "content management"