Bitcoin Core integration/staging tree

Monero: the secure, private, untraceable cryptocurrency

Modular ZK(Zero Knowledge) backend accelerated by GPU

free C++ class library of cryptographic schemes

Decentralized cryptocurrency blockchain daemon implementing the XRP Ledger protocol in C++

An FHE compiler for C++

Microsoft SEAL is an easy-to-use and powerful homomorphic encryption library.

🛡 I2P: End-to-End encrypted and anonymous Internet

HElib is an open-source software library that implements homomorphic encryption. It supports the BGV scheme with bootstrapping and the Approximate Number CKKS scheme. HElib also includes optimizations for efficient homomorphic evaluation, focusing on effective use of ciphertext packing techniques and on the Gentry-Halevi-Smart optimizations.

Cryptography Toolkit

Cryptographic filesystem for the cloud

RISC Zero is a zero-knowledge verifiable general computing platform based on zk-STARKs and the RISC-V microarchitecture.

IBM Fully Homomorphic Encryption Toolkit For Linux. This toolkit is a Linux based Docker container that demonstrates computing on encrypted data without decrypting it! The toolkit ships with two demos including a fully encrypted Machine Learning inference with a Neural Network and a Privacy-Preserving key-value search.

🇸Superpowered Audio, Networking and Cryptographics SDKs. High performance and cross platform on Android, iOS, macOS, tvOS, Linux, Windows and modern web browsers.

Qtum Core Wallet

TFHE: Fast Fully Homomorphic Encryption Library over the Torus

Concrete: TFHE Compiler that converts python programs into FHE equivalent

Public Blockchain as a Decentralized Finance Infrastructure Service Platform

Simple C++ Image Steganography tool to encrypt and hide files insde images using Least-Significant-Bit encoding.

An advanced SAT solver