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.
Better Notes - Simple notes app that ties notes together with #hashtags
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Startup Notes - Most actionable advice from each Startup School speaker
Slack - A messaging app for teams who see through the Earth!
Thought Train - Stop using sticky notes to remember what you're doing 📒 🚫