Free 1.13 Library/API Plugins

By TheProgramSrc — The best way to create a plugin

By TeamVK — Wrapper for Nashorn JavaScript engine

By jojodmo — A bridge between plugins like CustomItems and CustomEvents

By jojodmo — Use one plugin's items in other plugins | Store and Recall items | Supports CustomItems

By GroupeZ — Template for plugin creation - 1.7.10 - 1.17

By knokko — Required by some of my other plug-ins, but doesn't do much on its own

By jojodmo — A simple cross-version API for editing NBT tags, safe for many versions of Minecraft! +Commands

By Monetis_ — Library for all my premium plugins!

By Thatsmusic99 — Allows developers to add comments, sections and maintain option order in their config file.

By Xezard — Universal library for work with yml configurations

By AGMDevelopment — Basic API for AGMPlugins, providing required libraries.

By TeamVK — This is just empty shells for developers who wish to create a plugin talking to clip's AutoSell.