WackoWiki - WackoWiki is a light and easy to install multilingual Wiki-engine.
ColdCast - An open social network with zero corporate interference.
MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
ZeroMe - Social network for the distributed P2P network ZeroNet.
DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
GNU social - GNU social is communication software for both public and private communications.