WikiSuiteâ„¢ — the most comprehensive and integrated Free / Libre / Open Source enterprise software suite.

WikiSuite is especially suited to decentralized and knowledge-centric organizations and offers most (80%+) of the features all organizations need, such as: Email, Website, Blog, Shopping Cart, Intranet, Project Management, E-learning, Social Networking, Knowledge Base, Customer Support, File Sharing, Issue Tracker, Video Conferencing, LDAP, VPN, Gateway, Network, and more.

http://wikisuite.org/