Plugin Libraries & APIs · Developer Tool · by KyoriPowered
A user-interface library for Minecraft Java Edition: text components, colours, sounds, titles and boss bars.
Paper
Open source
Developer Tool
A protocol library for Minecraft Java Edition that makes processing and sending packets easier, across many platforms.
PacketEvents is a Minecraft plugin library or API for Paper, Spigot, Velocity, BungeeCord, Folia and Bukkit, listed under Plugin Libraries & APIs. It lists support for Minecraft 26.3 and 26.2. It is free.
From the source listing
PacketEvents is a library for developers that handles reading, modifying and sending network packets, with one API for Paper, Spigot, Fabric, Velocity, BungeeCord and Sponge. It is published under the GPL and has documentation on its wiki. Read the licence before bundling it into a plugin you distribute.
From the source listing
Same category
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Plugin Libraries & APIs · Developer Tool · by KyoriPowered
A user-interface library for Minecraft Java Edition: text components, colours, sounds, titles and boss bars.
Paper
Open source
Plugin Libraries & APIs · Developer Tool · by dmulloy2
Read and write access to the Minecraft protocol for Bukkit-family plugins.
Paper · Spigot · Bukkit
Open source
Plugin Development Tooling · Developer Tool · by PaperMC
The Gradle build system plugin for Paper and Paper forks, including userdev for building against server internals.
Paper