FMOD - FMOD Studio is an audio middleware solution and engine for games.
wxWidgets - wxWidgets: Cross-Platform GUI Library
Wwise - Game audio engine, designed to give artists more control and save programmers' time.
Electron - Build cross platform desktop apps with web technologies
SoLoud - Easy to use, free, portable c/c++ audio engine for games.
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.