Circom

ZK Email provides circuits and SDKs for proving facts about redacted email transcripts onchain. Useful when you want privacy-preserving identity or receipt checks without doxxing inboxes.

Railgun is a privacy protocol for Ethereum and EVM networks that provides shielded transactions and private DeFi interactions with zero-knowledge proofs.

snarkjs is a JavaScript and CLI toolkit for generating and verifying zkSNARK proofs, and for running common proving workflows in Node.js and the browser.

Noir is a Rust-inspired language for writing zero-knowledge circuits with a developer-friendly syntax and tooling maintained by Aztec.

Aztec is a privacy-first Ethereum rollup and developer platform for building applications with programmable privacy and zero-knowledge proofs.

Semaphore is a zero-knowledge protocol for private group membership proofs, enabling anonymous signaling and authentication without revealing identity.