HOPR is an open incentivized mixnet which enables privacy-preserving point-to-point data exchange. HOPR is similar to Tor but actually private, decentralized and economically sustainable.

Java Implementation of the Ethereum 2.0 Beacon Chain

CometBFT (fork of Tendermint Core): A distributed, Byzantine fault-tolerant, deterministic state machine replication engine

Charon (pronounced 'kharon') is a Proof of Stake Ethereum Distributed Validator Client

gnark is a fast zk-SNARK library that offers a high-level API to design circuits. The library is open source and developed under the Apache 2.0 license

Polaris is a modular implementation of the Ethereum Virtual Machine (EVM). It can be easily integrated into any consensus engine or application, including the Cosmos-SDK.