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http://www.tecgraf.puc-rio.br/iup/
http://www.tecgraf.puc-rio.br/iup/en/screenshots.html
IUP is a portable toolkit for building graphical user interfaces. It offers a configuration API in three basic languages: C, Lua and LED. IUP's purpose is to allow a program to be executed in different systems without any modification, therefore it is highly portable. Its main advantages are:

high performance, due to the fact that it uses native interface elements.
fast learning by the user, due to the simplicity of its API.

The Tecgraf products under this license are: IUP, CD and IM.

All the products under this license are free software: they can be used for both academic and commercial purposes at absolutely no cost. There are no paperwork, no royalties, no GNU-like "copyleft" restrictions, either. Just download and use it. They are licensed under the terms of the MIT license reproduced below, and so are compatible with GPL and also qualifies as Open Source software. They are not in the public domain, PUC-Rio keeps their copyright. The legal details are below.

The spirit of this license is that you are free to use the libraries for any purpose at no cost without having to ask us. The only requirement is that if you do use them, then you should give us credit by including the copyright notice below somewhere in your product or its documentation. A nice, but optional, way to give us further