VFsync

VFsync (for Virtual File Synchronization) is a secure file synchronization system. There are 3 ways to use it:

In a web based virtual machine. The files can be manipulated with all the standard Unix commands and imported or exported to the host system.
In a small Desktop based virtual machine. It is faster than the web based virtual machine and unlike other virtual machines, no disk image needs to be downloaded.
With a small standalone client directly running on the host system.

WARNING: VFsync is experimental, so data loss is possible.

Secure storage (client based AES encryption)
Synchronize files from multiple devices. The modifications are commited atomically as in source control systems such as Git or Subversion.
Web based Linux virtual machine to securely access the files from any device
Desktop based virtual machine for faster access without having to download anything
Small standalone Linux client requiring no installation
Virtual machines can be customized and linked from another site
Open source (MIT license)