Audio Overload is described as 'emulates the sound hardware of vintage consoles and computers, allowing you to listen to completely authentic renditions of classic video game tunes' and is an app in the Audio & Music category. There are three alternatives to Audio Overload for a variety of platforms, including Windows, Android, iPad, iPhone and Linux. The best alternative is ZXtune, which is both free and Open Source. Other great apps like Audio Overload are Modizer (Free, Open Source) and Chipamp (Free).
Chipamp is a free bundle of existing plugins for Winamp that lets you play a variety of chiptune and tracker formats, including music from classic game consoles like the NES, SNES, Sega Genesis, Gameboy, and Playstation.