Alternatives to IUP Portable User Interface for all platforms with any license

Platforms

Desktop

Indie / Classic

  • Qt icon

    Qt

    Qt is a cross-platform application framework that is widely used for developing application software that can be run on various...

    Open Source Mac Windows Linux

  • GTK+ icon

    GTK+

    GTK+ is a multi-platform toolkit for creating graphical user interfaces. Offering a complete set of widgets, GTK+ is suitable for...

    Open Source Mac Windows Linux

  • wxWidgets icon

    wxWidgets

    wxWidgets is a C++ library that lets developers create applications for Windows, OS X, Linux and UNIX on 32-bit and 64-bit...

    Open Source Mac Windows Linux

  • Agar icon

    Agar

    Agar is a modern open-source, cross-platform toolkit for graphical applications implemented in C, C++ and Ada (with bindings to other...

    Open Source Windows Linux BSD

  • FLTK icon

    FLTK

    The Fast, Light Toolkit (FLTK, pronounced fulltick)[2] is a cross-platform graphical user interface (GUI) library developed by Bill...

    Open Source Mac Windows Linux

  • TK

    Tk is a free and open-source, cross-platform widget toolkit that provides a library of basic elements of GUI widgets for building a...

    Open Source Mac Windows Linux

  • Fox toolkit icon

    Fox toolkit

    The FOX toolkit is an open source, cross-platform widget toolkit, that is, a library of basic elements for building a graphical user...

    Open Source Mac Windows Linux

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