OpenAL - OpenAL is a cross-platform 3D audio API appropriate for use with gaming applications and many other...
SoLoud - Easy to use, free, portable c/c++ audio engine for games.
Unity - The multiplatform game creation tools for everyone.
PortAudio - PortAudio is a cross platform, open-source, audio I/O library.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
JUCE - JUCE is a wide-ranging C++ class library for building rich cross-platform applications and plugins...