trezor-crypto - Heavily optimized cryptography algorithms for embedded devices.
emmy - Library for zero-knowledge proof based applications (like anonymous credentials).
s2n - Implementation of the TLS/SSL protocols.
LibHydrogen - Lightweight, secure, easy-to-use crypto library suitable for constrained environments.
saltpack - Modern crypto messaging format.
Keybase - Secure groups, files, and chat for everyone.
Signal - Secure messenger.
Cryptocoding - Guidelines for low-level cryptography software.
Tink - Multi-language, cross-platform, open source library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.
Ring - Safe, fast, small crypto using Rust.
dalek cryptography - Fast, safe, pure-rust elliptic curve cryptography.
Trillian - Transparent, highly scalable and cryptographically verifiable data store.
BLAKE3 (in Rust) - Cryptographic hash function.
awesome-mpc - Curated list of multi party computation resources and links.
Fiat-Crypto - Cryptographic Primitive Code Generation by Fiat.
CIRCL - Cloudflare Interoperable Reusable Cryptographic Library.
cosign - Cooperative RSA signatures.
Cryptopals - Collection of 48 exercises that demonstrate attacks on real-world crypto.