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.
The main goal of Callisto is to research and develop a reference implementation of a self-sustaining, self-governed, self-funded blockchain ecosystem and development environment. Callisto aims to establish a secure and contribution-friendly environment for further protocol development and improvements. It will rely on a built-in system of smart-contracts to achieve this goal.