Wiki knowledge management for WordPress. 100% open source GPL. Use any theme. No modifications required.
Paid • Proprietary
What is UserPress?
UserPress is a wiki plugin for WordPress offering sophisticated functionality wrapped in a simple, intuitive interface. UserPress allows users to edit and create content using your front-end theme (as opposed to the wp-admin area), much like Wikipedia. UserPress can easily take advantage of the thousands of plugins already built for WordPress. UserPress is going to change the way you think about collaborative media.
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The plugin seems to be no longer updated. Last version, 2.0.6, released in July 2015, can be still downloaded from CodeCanyon.net