Powerful webdav client and sync tools with client-side AES encryption
C++ cryptographic library (modern hash functions, ciphers, KDFs)
antigift is simple cross-platform, files & folders encryption tool
52 Hash Functions In One Program, plus each with HMAC or KMAC
Secure mail + Tor gateway
xxteac - XXTEA Encrypter/Decrypter
Encryption addressing long-term data secrecy