Fox toolkit
Software
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The FOX toolkit is an open-source, cross-platform widget toolkit, i.e. a library of basic elements for building a graphical user interface. FOX stands for Free Objects for X.
It features a hard-wired Windows 95-style theme available for both... Wikipedia
Programming language: C++
Developer(s): Jeroen van der Zijp, FOX community
License: GNU Lesser General Public License with License Addendum allowing static linking fox-toolkit.org/license.html