The code from the Applied Cryptography disk, available outside the US.

Cryptographic classes for Microsoft .NET. Includes DES, TripleDES, RC2, and Rijndael (AES) implementations.

Supports the following algorithms; BLOWFISH, TWOFISH, DES, TripleDES, 3-WAY, SAFER-sk64, SAFER-sk128, SAFER+, LOKI97, GOST, RC2, RC6, MARS, IDEA, RIJNDAEL-128 (AES), RIJNDAEL-192, RIJNDAEL-256, SERPENT, CAST-128, CAST-256, ARCFOUR and WAKE. ANSI C.

An open source cryptography library that contains highly optimized C and assembler implementations of many well-known algorithms including Blowfish, MD5, SHA-1, Diffie-Hellman and ElGamal.

A powerful security toolkit which allows even inexperienced crypto programmers to easily add encryption and authentication services to their software.

A free, public domain implementation of RSA Data Security's BSAFE API, using the SSLeay crypto library.

A collaborative effort to develop a robust, commercial-grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library.

A Java open source cipher that combines one time pad with public and private keys.

Free C++ library for cryptography: includes ciphers, message authentication codes, one-way hash functions, public-key cryptosystems, and key agreement schemes.

Library of cryptographic primitives in ANSI C, including block ciphers and hash functions, together with generic modes of operation. Also includes simple key management system, multiprecision arithmetic, and public key algorithms.