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IUP Portable User Interface

IUP is a multi-platform toolkit for building graphical user interfaces.

6 Alternatives To IUP Portable User Interface

Agar

Agar GUI

FLTK

Fast Light Toolkit - Fast Light Toolkit (FLTK)

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Fox toolkit

fox-toolkit.org

Qt

C++

Uno Platform

Build Mobile, Desktop and WebAssembly apps with C# and XAML.

wxWidgets

wxWidgets: Cross-Platform GUI Library