SoLoud is described as 'is portable - the c/c++ code base is written in portable way, and the code has been used on various platforms including windows, osx, linux, as well as android and even ps4' and is an app in the Education & Reference category. There are six alternatives to SoLoud for a variety of platforms, including Mac, Windows, Linux, Android and iPhone. The best alternative is PortAudio, which is both free and Open Source. Other great apps like SoLoud are Wwise (Freemium), FMOD Ex (Free Personal), RtAudio (Free, Open Source) and OpenAL Soft (Free, Open Source).
RtAudio is a set of C++ classes that provide a common API for realtime audio input/output across Linux, Macintosh OS-X and Windows operating systems. RtAudio significantly simplifies the process of interacting with computer audio hardware.
OpenAL Soft is an LGPL-licensed, cross-platform, software implementation of the OpenAL 3D audio API. It's forked from the open-sourced Windows version available originally from the SVN repository at openal.org.