I am a core team member of PaperMC. Its main project, Paper, is the most widely used, performant, and stable Minecraft server software available.
ViaVersion
I maintain ViaVersion, allowing both older and newer Minecraft client versions to connect to almost any server; why lose players after a Minecraft update?
Hangar
Hangar is a plugin repository for Paper and Velocity plugins.
Item Command Converter
Convert your old NBT item commands to the new 1.20.5 format.
ViaUtilities
Entity packet data definitions for versions 1.14.4 and up, possibly more soon:tm:
