NGUI is a powerful UI system and event notification framework for Unity (both Pro and Free) written in C# that closely follows the KISS principle. It features clean code and simple, minimalistic approach to everything. Most classes are kept under 200 lines of code. For a programmer this means a much easier time when it comes to working with the kit — from extending its functionality to tweaking the existing one. For everyone else this means better performance, less frustration, and more fun.