Bitcoin 2 is a scalable Bitcoin fork that supports private transactions through the Zerocoin protocol and nearly instantly verified payments by Masternodes. Bitcoin 2 uses a Proof of Stake system that allows anyone even running a basic laptop to get block rewards while contributing to running the blockchain.
Semux is an experimental high-performance blockchain platform that powers decentralized application. It's written purely in Java and powered by Semux BFT consensus algorithm.