Also known as palimpsest, gnome-disk-utility provides libraries and applications for dealing with storage devices.
GNOME Disks Features
Tomb is an 100% free and open source system for file encryption on GNU/Linux, facilitating the backup of secret files. Tomb is written in code that is easy to review and links commonly shared components.
Tomb Features
EncFSMP, a program to mount EncFS folders on Windows and OS X.
EncFSMP Features