- configurate 29 A simple configuration library for Java applications that can handle a variety of formats and provides a node-based data structure able to handle a wide variety of configuration schemas
- libcomponents 12 A component system currently used in CommandBook.
- Glowstone 8 An open-source Java Minecraft server originally by Graham Edgecombe, adapted for the Bukkit interface.
- onevent 7 onEvent is a fast event system written in Java.
- netevents 7 A Bukkit plugin that allows other plugins to easily pass their events across multiple servers without requiring the other server to have online players.