Dropbox - Online Sync and File Sharing

ShareVault - ShareVault provides Virtual Data Rooms for secure document sharing during due diligence and other business critical processes.

Mega - Secure File Storage and collaboration

iDeals Virtual Data Room - iDeals Virtual Data Room is a tool that provides secure access to large amount of confidential documents and can view, analyze and collaborate in a protected environment.

ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.

Drooms - Virtual data room software