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.
Nextcloud Hub - On-premises, enterprise collaboration solution for documents, emails, calendars and more.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
GreenOrbit - Intranet software with everything you need, built in
Slack - A messaging app for teams who see through the Earth!
Oak Engage - Oak Engage is a digital workplace for enterprises that need to communicate with their workforce. Connect your teams. Engage your people.