Knowledge Tree is an open source document management system (DMS) that helps enterprise users categorize, store, index, and share documents. It offers features like metadata editing, versioning, and WebDAV access, which make it a better choice than a simple file server for sharing documents.
The open source edition of the PHP-based Knowledge Tree ships under GPLv3; a commercial version with some additional features and support bundled is also available. You can run Knowledge Tree on Linux, Windows, or any platform that can run Apache, MySQL and PHP. The commercial application also has a Windows client for non-Web access to the repository.