A complete and free implementation of the OpenPGP standard. [GPL]
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General purpose TLS and crypto library
Cryptomator for Windows, macOS, and Linux: Secure client-side encryption for your cloud storage, ensuring privacy and control over your data.
Tink is a multi-language, cross-platform, open source library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.
Safely store secrets in Git/Mercurial/Subversion