MS SharePoint - Share, organize, and discover information with Microsoft SharePoint. Learn about SharePoint Online, OneDrive for Business, and Apps for SharePoint
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.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Ryver - Ryver provides all of your team communications in one place: chats, posts, and files.
Slack - A messaging app for teams who see through the Earth!
Podio - Podio is the online work platform. Manage, share, and get your work done smarter together with tools that work like you. Free for 10 Users.