Meatamp is a music player for video game sound formats, such as NSF, SPC, and GBS files.
You can grab some NSF files to test this out from chipmusic.org.
Use the button to select a file to play.
Meatamp was made by @Osmose.
Meatamp has been tested on Firefox Nightly and Chrome. If you find bugs in other versions/browsers, feel free to file an issue, although I make no promises of issues ever getting fixed.