DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
Do - Do helps you run productive meetings. Do work you love.
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
Kurator - The premier Chrome extension for savvy researchers and publishers alike. Curate your interest and publish to your website, newsletter and social media sites directly from the browser.
TiddlyWiki - a non-linear personal web notebook
Vabotu - More than slack. More than Trello. FREE.