You can try DocMGR (my project) at
http://docmgr.sourceforge.net/.
Features in no particular order:
- Web-Based. Supports all major browsers
- Multiple language support
- Supports document workflow
- Has a summary page to monitor recently added files you've checked out, Bookmarked collections, etc
- Built on a modular system to allow easy addition/removal of features
- Email, and anonymous email sending
- md5 file verification on viewing
- File Checkin/checkout.
- File discussion forums for each file
- Full text search and keyword search. You can also optionally add tsearch2 support for advanced full text indexing and search
- Fine-grained file and collection permissions based on per-user or per-group authentication
- WebDAV support. This works for browsing and copying, but not for checking out files (yet)
- It's been around for a while and has a decent size user base
- Zipped collection download
There's more, but I'm tired of typing and you get the picture...