Zoho Desk

Industry’s first context-aware Helpdesk Software.
MoinMoin

MoinMoin is an advanced, easy to use and extensible WikiEngine with a large community of users.
ConnectedText

ConnectedText is a powerful but simple information management system.
MDwiki

Static single file CMS/Wiki done purely with client-side Javascript and HTML5.
Foswiki

Foswiki is the free and open source enterprise collaboration platform.
Banana Dance Wiki/CMS

Free open source software combining the best of wiki and CMS with community building-features.
BookStack

An open source knowledge management application that’s focused on ease of use.
UserEcho

UserEcho gives you the opportunity to create a modern Community to support customers in a few minutes.
It includes support forum with the possibility of voting for ideas, Helpdesk, Knowledge Base and Online Chat.
XWiki

A powerful Open Source collaborative platform enhancing collaboration and communication.
Wiki.js

An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.