Coherent GT - Fast user interface runtime for PC and Consoles
PortAudio - PortAudio is a cross platform, open-source, audio I/O library.
Sciter - Embeddable HTML/CSS/script engine
OpenAL Soft - OpenAL Soft is an LGPL-licensed, cross-platform, software implementation of the OpenAL 3D audio API.
Ultralight - Fast, light HTML UI solution for C++ apps
JUCE - JUCE is a wide-ranging C++ class library for building rich cross-platform applications and plugins...