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 software and hardware platforms with little or no change in the underlying codebase, while having the...

    Open Source Mac Windows Linux BSD

  • GTK+ icon

    GTK+

    GTK+ is a multi-platform toolkit for creating graphical user interfaces. Offering a complete set of widgets, GTK+ is suitable for projects ranging from small one-off tools to complete application suites.

    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 architectures as well as several mobile platforms including Windows Mobile, iPhone SDK and embedded GTK+. It...

    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 languages in development). Designed for ease of integration, it follows the philosophy of building...

    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 Spitzak and others. Made to accommodate 3D graphics programming, it has an interface to OpenGL, but it...

    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 graphical user interface (GUI) in many different programming languages.

    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 interface (GUI). It features a hard-wired Windows 95-style theme available for both Microsoft...

    Open Source Mac Windows Linux

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