a number of X window system GUI toolkits.
"This article is aimed at Unix developers who already have some experience with programming languages and want to start developing GUI applications (mainly for The X Window System, though portability is discussed). It may also come in handy if you have used a particular GUI toolkit for some time and want to know whether others might suit your needs better. The main focus is comparison and introduction, but it serves as a bit of tutorial, as well.
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