A new S2C implementation with some protocol changes is being under active development in Rust. This implementation is not maintained any more.
A full-featured state machine replication (SMR) on S3 implementation in Java. Powered by virtual threads with a highly observable (Micrometer & structured logging) and lightweight core with minimal dependencies, S2C is designed for practical use in modern Java (21+) applications requiring reliable distributed coordination.
See the design document for full protocol, architecture, and internals.