- [TrueCrypt is not exactly "Open Source", but the source is available. See the reviews to get more information.] TrueCrypt is a disk encryption software for Windows Vista/XP, Mac OS X, and Linux.
- Free • Open Source
Currently unmaintained. Last version, TrueCrypt 7.1a, is still available for download and development has continued via the forks VeraCrypt and CipherShed. "The development of TrueCrypt was ended in 5/2014 after Microsoft terminated support of Windows XP. Windows 8/7/Vista and later offer integrated support for encrypted disks and virtual disk images."
- FileVault is a method of using encryption with volumes on Mac computers. Encryption and decryption are performed on the fly. FileVault 2 uses full disk, XTS-AES 128 encryption to help keep your data secure. Using FileVault 2, you can encrypt the contents of your entire drive.
- Free • Proprietary