The topic died a while ago and massive updates have come since then, so I thought I'd recreate this topic.
Ultrabit is an ever-growing collection of "chipmusic" formats, which can be any of video game music from various consoles, some chip-style audio OSTs for newer games, old pc demoscene and tracker music, or keygen music. It is a bt/resilio sync folder maintained by me, Slender, and occasionally Family Mario, that receives updates at least once a month, if not a lot more. It consists of a plethora of ROM dump and tracker formats that require specialized emulation type players to use, so don't expect it to work on your average mp3 player . Input plugins are available for foobar2000 through it's official components repo for things like mod files and other game formats, and we recommend the prerelease or maybe stable builds of libopenmpt for playing mod files. A preconfigured foobar2000 is also provided within the folder in a 7z. Input plugins for all these formats are also available including that libopenmpt for winamp and XMplay. You can find some winamp input plugins from modland here via http (warning; extremely slow and shouldn't be relied on) or via ftp if your browser reads ftp. You'll need the kss music plugin. The NSFPlay 7z folder in the sync includes a winamp plugin to properly play our NSF collection, things like famicompo. Winamp must be used to play at least kss and nsf files, every other plugin is optional but if you prioritize winamp over foobar then have at it. This folder is currently weighing in at a wapping 25 gigs and growing slowly, due to the small nature of most file formats you shouldn't notice many size spikes unless some streamed audio formats get pushed. There is a massive changelog as well.
The folder is available under a BTSync key, however hosted on resilio so some users may have trouble downloading. Read key is as follows.
Edit: edited section relating to winamp plugins to point to the modland repo for them for people who want to use winamp as a primary or for the basic formats you need to play the stuff anyway.
An anomaly in the matrix. An error in existence. A being who cannot get inside the goddamn box! A.K.A. Me.