Awesome

FFGUI

Provides basic cross-platform graphical user interface (GUI) for C and C++ based on:

• GTK+
• Win32 API

The main feature is the UI loader - mechanism that builds UI at runtime from specially formatted text file containing definitions of UI elements, their initial properies and runtime action codes. The back-end parser (ffbase/conf.h) can utilize SSE4.2 for ultra fast processing.

Other features:

• Auto hotkeys
• Multi-language ready
• GTK+: asynchronous UI messages
• GTK+: listview on-demand drawing emulation
• Win32 API: basic vertical-horizontal auto positioning of UI elements and resizing
• Win32 API: UTF-8
• Very thin C++ layer that's completely inlined by the compiler

Based on [ffsys] (https://github.com/stsaz/ffsys) & ffbase.