HeySpace - HeySpace is the only free task and simple project management software with communication and collaboration feature.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
P2 - Share, discuss, and collab with your team. By Wordpress.
MS SharePoint - Share, organize, and discover information with Microsoft SharePoint. Learn about SharePoint Online, OneDrive for Business, and Apps for SharePoint
Slack - A messaging app for teams who see through the Earth!
Confluence - Confluence is content collaboration software that changes how modern teams work