True Crypt

Company: True Crypt Foundation
License: Freeware
Platform: Windows
Category: System Utilities
Free open-source disk encryption software for Windows 7/Vista/XP, Mac OS X, and Linux
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Main Features:
Creates a virtual encrypted disk within a file and mounts it as a real disk.
Encrypts an entire partition or storage device such as USB flash drive or hard drive.
Encrypts a partition or drive where Windows is installed (pre-boot authentication).
Encryption is automatic, real-time (on-the-fly) and transparent.
Parallelization and pipelining allow data to be read and written as fast as if the drive was not encrypted.
Provides plausible deniability, in case an adversary forces you to reveal the password:
Hidden volume (steganography) and hidden operating system.
Encryption algorithms: AES-256, Serpent, and Twofish. Mode of operation: XTS.
News / Comments
TrueCrypt 7.0 Released
Among the new features are hardware-accelerated AES, support for devices that use sector sizes other than 512 bytes, ability to configure a volume to be automatically mounted whenever its host device gets connected to the computer, favorites organizer, and more.