Coherent GT - Fast user interface runtime for PC and Consoles
FMOD - FMOD Studio is an audio middleware solution and engine for games.
Sciter - Embeddable HTML/CSS/script engine
OpenAL - OpenAL is a cross-platform 3D audio API appropriate for use with gaming applications and many other...
Ultralight - Fast, light HTML UI solution for C++ apps
SoLoud - Easy to use, free, portable c/c++ audio engine for games.