FMOD - FMOD Studio is an audio middleware solution and engine for games.
SoLoud - Easy to use, free, portable c/c++ audio engine for games.
Wwise - Game audio engine, designed to give artists more control and save programmers' time.
3Dception - Download 3Dception Binaural Demo apk 1.0 for Android. A tech demo of 3Dception, a real-time cross-platform 3D audio binaural engine
OpenAL Soft - OpenAL Soft is an LGPL-licensed, cross-platform, software implementation of the OpenAL 3D audio API.
PortAudio - PortAudio is a cross platform, open-source, audio I/O library.