NextPlane - NextPlane offers cloud-based, scalable unified communications federation service for the enterprise.
Dropbox - Online Sync and File Sharing
Voxer - Turn your phone into a Walkie Talkie. Don't waste time on phone calls and voicemails.
Mega - Secure File Storage and collaboration
Sameroom - Chat interoperability-as-a-service
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.