DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
Ollert - Learn what your Trello boards aren't telling you
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
TiddlyWiki - a non-linear personal web notebook
SendBoard for Trello - Receive and reply to emails in Trello