DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
Wult.io - Accessible self serve data governance
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
Team-One - Team-One is more than messaging; it’s teamwork made simple.
TiddlyWiki - a non-linear personal web notebook
Getodo - colorful lightweight multi-level to-do list on Android, iOS, web.