SparkleShare - SparkleShare is very different from the traditional file storage and sharing services.
Microsoft 365 - Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
Apache OpenOffice - Apache OpenOffice is an open source, office document productivity suite.
Resilio Sync - Resilient, fast and scalable file synchronization for enterprises and individuals
SoftMaker Office - SoftMaker Office is one of the most powerful and reliable office suite that is fully compatible with the MS Office Suite.