Backchannel Chat - Backchannel Chat is best in class discussion tool that is intended for teachers to streamline their class activities.
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.
NowComment - NowComment is a complete suite of collaboration tools, streamlining group discussion, annotation, and curation of texts, images, and videos.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Eduflow - Digital learning that actually teaches students something
Slack - A messaging app for teams who see through the Earth!