Cards against Humanity - A party game for horrible people.
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.
Cards Lacking Originality - A simple and elegant online Cards Against Humanity clone
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Superfight - Superfight is a Multiplayer Card video game developed by Pipeworks Studio and published by 505 Games.
Slack - A messaging app for teams who see through the Earth!