Slite - Your company knowledge
wikiHow - wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual.
BlueSpice for MediaWiki - BlueSpice is your tool for documentation and centrally collecting and sharing knowledge.
Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.
Dropbox - Online Sync and File Sharing
AllAnswered - Your Team's Collective Brain All-In-One Knowledge Management System Wiki + Q&A + Workflow + AI