Lunyr - A decentralized crowdsourced encyclopedia.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Tealfeed - A knowledge sharing platform to empower creators
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Noat Cards - A knowledge learning and sharing platform
Slack - A messaging app for teams who see through the Earth!