Facebook has open-sourced Fizz, a library designed to help developers implement the new TLS 1.3 protocol. Fizz is written in C++ and available on GitHub, and anyone can access and use it. Facebook has already replaced its older custom protocol, called Zero protocol, with Fizz which is now responsible for securing trillions of connections every day at Facebook. The social media giant says it has deployed Fizz globally in its mobile apps, Proxygen, load balancers, internal services, and even our QUIC library, mvfst.
Source: https://thehackernews.com/2018/08/fizz-tls-ssl-library.html