ofxUI is an addon for openFrameworks (version 07) by Reza Ali that easily allows for the creation of user interfaces aka GUIs. ofxUI also takes care of widget layout, spacing, font loading, and widget callbacks. ofxUI can be easily customized (colors, font & widget sizes, padding, layout, etc).ofxUI is a GL based GUI and uses openFramework’s drawings calls to render its widgets. It integrates into openFrameworks projects very easily since it was designed specifically for OF. Just drag and drop the addon into your project, copy the GUI folder from an example project’s data folder into your data folder. The README in the ofxUI addon folder includes a step by step tutorial on how to use the library in your projects in under 10 minutes. There are many examples included in the download that show how to add widgets, customize their placement, get values from different types of widgets, set widget values, add callback functions for gui events, and more.