HelpCrunch Knowledge Base - Deliver instant answers to customers 24/7 with help articles
DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
Slab - Slab is a knowledge hub for the modern workplace. We help teams unlock their full potential through shared learning and documentation. Slab features a beautiful editor, blazing fast search, and dozens of integrations like Slack, GitHub, and G Suite.
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
TiddlyWiki - a non-linear personal web notebook