snip snip This is really the most important point. The only part going away is the Transport/LLAPI. The HLAPI is open source, though it will be useless without the LLAPI. There are many transports out there that can replace it either in your code or in a higher-layer abstraction like the HLAPI. This should serve anyone managing to ship networked games in MonoBehaviour projects for as long as people care to build and maintain them. I would highly (and specifically) recommend https://github.com/MidLevel/MLAPI to anyone going that route. It's actively maintained as of today and a genuine improvement over the HLAPI. The maintainers actually understand what they're doing regarding both networking and writing clean Unity code.