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 E4M is no longer maintained; it's author (Paul Le Roux) having joined Shaun Hollingworth (the author of the ScramDisk) to produce E4M's commercial successor, DriveCrypt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 although unable to run under Windows 9x/Me, added cross-platform support together with plausible deniability, support for volumes larger than 2GB and 128-bit block ciphers (e.g. AES, Serpent, Twofish).