EncFS - virtual encrypted filesystem for Linux
Love it. Easy to use. EncFS works well with cloud storage services. EncFS has several advantages over other disk encryption softwares: * EncFS "volumes" do not occupy a fixed size. Instead they grow and shrink as more files are added to or removed from the mountpoint; * Backup utilities can back up only the files that have changed in the source directory; * Corruption of data is more isolated; * You can change your password without having to re-encrypt all files.