SimplexCore is a plugin created by Simplex Development Group.
This plugin is an API and framework plugin designed to make plugin development easier, and more user friendly.
SimplexCore vastly reduces boilerplate by creating autonomous functions which do most of the tedious work for you. Registering commands is as simple as creating classes annotated with the @CommandInfo annotation, and extending SimplexCommand, which automatically registers with the spigot framework. This removes the need of using the plugin.yml to define commands and permissions. Creating items uses a worker class which is a recursive object that builds an item and outputs the result. SimplexListener subclasses are automatically registered upon new class initialization.
Everything is still in the process of being JavaDocced, so if there is no javadocs for the class or method you are trying to use, one will be added in a future update.