Bug-fix-only libev port of shadowsocks
Complete and free implementation of the OpenPGP standard
AWS Encryption SDK for C
Powerful webdav client and sync tools with client-side AES encryption
57 Hash Functions In One Program, plus each with HMAC or KMAC
NCrypted - simple file encryption software with GPU support
A tiny, fast encryption tool in C
A family of FLEA-inspired CSPRNGs and Stream Ciphers
A family of small-state CSPRNGs and Stream Ciphers
xxteac - XXTEA Encrypter/Decrypter
Simple, lightweight, standalone command-line single file encryption.
A free "on-the-fly" transparent disk encryption program for PC & PDAs.