Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
AMuseWiki - Amusewiki is more than just a wiki engine, it’s also a powerful authoring, archiving and publishing platform.
Oddmuse - Oddmuse is a wiki engine.
BetterDocs - Create & Manage Knowledge Base Documentation Effectively To Reduce Support Tickets, Increase productivity & User Experience with BetterDocs.
MoinMoin - MoinMoin is an advanced, easy to use and extensible WikiEngine with a large community of users.
DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.