RaphiMC

Speed up immediate mode rendering in Minecraft

Open source minecraft authentication protocol for proxies

ViaVersion addon to add support for some notable Minecraft snapshots.

Minecraft Fabric mod which allows you to join EVERY Minecraft server version (Classic, Alpha, Beta, Release, April Fools, Bedrock)

A BungeeCord plugin to fix compatibility issues with ViaProxy, enabling seamless multi-version support for backend servers with reduced overhead.