E4M
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Encryption for the Masses (E4M) is open-source, free disk encryption software for Windows NT/9x/Me. E4M is no longer maintained; its author (Paul Le Roux) having joined Shaun Hollingworth (the author of the ScramDisk) to produce E4M's commercial successor, DriveCrypt.
E4M's source code was used as the basis of TrueCrypt, which added, for example, a Linux version, plausible deniability, support for volumes larger than 2GB, 128-bit block ciphers (e.g. AES, Serpent, Twofish), support for keyfiles and language packs, and which fixed many major bugs and security issues.