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.
Watch2Gether - Watch2Gether is an app that allows multiple people to watch the same content simultaneously and interact with each other while watching.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Metastream - Watch streaming media with friends
Slack - A messaging app for teams who see through the Earth!
StreamParty - StreamParty is a watch communiry, that allows you to watch video streams in sync with the people you care about, on multiple services.