GeyserA bridge/proxy allowing you to connect to Minecraft: Java Edition servers with Minecraft: Bedrock Edition.
SnapRun BungeeCord plugins on Velocity!
ElytraProxyReally customizable Minecraft proxy server with Auth, AntiBot, etc, based on Velocity. Supports 1.7 - 1.17.1
command-flowA flexible command framework and dispatcher which removes lots of boilerplate code used in commands. While it is used generally on Bukkit it is platform agnostic
ChatControl-ProThe ultimate chat solution. Prevent spam, ads, swears and even bots on your server. Replaced by ChatControl Red: https://mineacademy.org/chatcontrol-red