The Plug-in Authoring Kit (PAK) is a project for Strange Eons that includes an extensive collection of sample code and other resources for plug-in authors. The latest version can be downloaded from the Strange Eons download page (source code is available on GitHub).
The PAK is divided into a number of subfolders:
Code Snippets and Demos
Standalone demo scripts that you can open and run. Covers a wide variety of topics.
DIY Examples
Contains several plug-in subtasks that demonstrate how to add new game component types. Examples range from focused examinations of a single topic to complete, polished examples.
Graphics Templates
Templates for creating the various icons and other interface graphics used in various parts of the application.
Minimal Examples
Complete but minimal plug-in projects.
Project Examples
Plug-ins that demonstrate how to extend the project system.
Tool Examples
Plug-ins that demonstrate adding new Tools.
Make Bundles
An automation script that creates installable plug-in bundles for all of the plug-in tasks in the kit.