FOX is a C++ based Toolkit for developing Graphical User Interfaces easily and effectively. It offers a wide, and growing, collection of Controls, and provides state of the art facilities such as drag and drop, selection, as well as OpenGL widgets for 3D graphical manipulation. FOX also implements icons, images, and user-convenience features such as status line help, and tooltips. Tooltips may even be used for 3D objects!
它基本上支援的平台有:Linux, FreeBSD, SGI IRIX, HP-UX, IBM AIX, SUN Solaris, DEC/Compaq Tru64 UNIX, to MS-Window operating systems like Windows 9x, Windows NT, Windows ME and Windows 2000. 其實XP也跑得很好！

我個人是採用FOX-toolkit 1.7.18(snapshot)+MSYS+MinGW來測試,發現一個功能完整的計算機程式範例,也只需1.84MB大小,而且速度奇快無比！有興趣的人可以研究看看！