Keybase Go library, client, service, OS X, iOS, Android, Electron
Complete and free implementation of the OpenPGP standard
A simple, modern and secure encryption tool (and Go library)
GnuPG for Windows
Easy-to-use and powerful homomorphic encryption library
AWS Encryption SDK for C
CLI wrapper around aws-encryption-sdk-python
Bug-fix-only libev port of shadowsocks
Secure software enclave for storage of sensitive information in memory
A high-level OpenPGP library
transparently encrypt files within a git repository
Open source disk encryption with strong security for the Paranoid
Sign PDF with Digital Signature Certificate
Secure communication software
Open source file encryption software
antigift is simple cross-platform, files & folders encryption tool
STROBE cryptographic protocol framework
C++ cryptographic library (modern hash functions, ciphers, KDFs)
FinalCrypt - Unbreakable One-Time Pad Encryption
Stanford Javascript Crypto Library
FIDO strong authentication, encryption, digital signature engine
Squeezer framework, build serverless dApps
more convenient one-time-pad encryption.