Dropbox - Online Sync and File Sharing
Backblaze - Backblaze's remote backup automatically backs up your data to our secure datacenter.
Syncthing - Syncthing replaces proprietary sync and cloud services with something open, trustworthy and...
CrashPlan - CrashPlan for Small Business backup software offers the best way to back up and store business & enterprise data securely - offsite, onsite & online in the Cloud.
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
SpiderOak - SpiderOak makes it possible for you to privately store, sync, share & access your data from everywhere.