SlashOrg Downloader is a PHP file management solution. It uses special "access links" generated by the administrator that allow access to a shared folder until they expire or have exceeded the maximum usage limit authorized. It also features easy installation, multilingual support, per- folder and per-file rights management, simple Web- based administration, user accounts and user rights management, file uploads, download speed limits, ISO and Unicode support, and much more.
Kaolak is a Web-based community system. A Kaolak community is defined by its users and documents and forms a Kaolak branch. Kaolak is designed to handle many branches transparently from each other, within a single instance (one URL, one database). It features a permission scheme which allows users to give read/write access to documents they own to other groups/users. With a little PHP knowledge, modules can be implemented to extend Kaolak functionality.
Volley is a modular client/server application for chat, file sharing, and so forth. It is similar to Hotline, except its modular design allows for the addition of more services than just the usual chat, files, and news; there could be multiplayer games, and online meeting tools such as virtual whiteboards.