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.
Niko Niko - Employee Engagement
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
#TrelloAnnualReport - Get some fun free stats for your team's year on Trello!
Slack - A messaging app for teams who see through the Earth!
Information is Beautiful - Ideas, issues, knowledge, data — visualized!