C++ UI Libraries

Nana is a cross-platform C++ library for creating graphical user interfaces, currently it supports Windows, Linux(X11) and Mac OS(experimental) platforms. FLTK (pronounced “fulltick”) is a cross-platform C++ GUI toolkit for UNIX®/Linux® (X11), Microsoft® Windows®, and MacOS® X. FLTK provides modern GUI functionality without the bloat and supports 3D graphics via OpenGL® and its built-in GLUT emulation. Boost.UI is a C++ User Interface (GUI) Boost library that is cross-platform, uses native system-provided widgets, has STL-like and Boost-like API, is compatible with other Boost libraries and supports modern C++11/14/17 features.

Source: philippegroarke.com