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IUP
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Review of IUP powered by the Slant community.
IUP is a multi-platform toolkit for building graphical user interfaces. It offers a simple API in three basic languages: C, Lua and LED. IUP's purpose is to allow a program source code to be compiled in different systems without any modification. Supported systems include: GTK+, Motif and Windows.
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Pros
Pro Lightweight library and simple C interface
Pro Native controls on each supported OS
Pro Just UI
Easier to mix with other libraries since it doesn't try to control all that.
Pro Free/gratis
Pro MIT license
Pro Supports embedded OpenGL
Cons
Con Just UI, no additional functionality support (like network etc)
Commonly Compared
IUP
vs