The MOD Archive
//modarchive.org/
MODArchive is a collection of module/tracker files. It's a community project, and categorizes individual audio files. You'll need a MOD-capable audio player.
XMP/libxmp
MikMod
MODPlug for XMMS
GModplay
VLC (built-in support)
Configuration
See recording configuration if you want to enable the download mode.
Audio files are packaged up in ZIP files on MODArchive. While they are different formats (IT, S3M, XM, etc) they'll all carry a generic audio/mod+zip type specifier in streamtuner2.