And now wet have Nextcloud, which is the open source online ecosystem. You self just and control your own cloud synchronization, collsboration and file sharing.

Nextcloud gives you

- Contacts

- Calendar

- File sharing

- Video Conferencing

- Document Sharing & Collaboration

- Protect Planning & Collaboration

- Note syncing

- Private Messaging App w/video & audio calls

- Password Management & Sync

- Tasks (includes KanBan/Sprint board tasks)

- Forms

Plus many, many more, such as

- Photos

- Cookbook

- Map