DUMB is an IT, XM, S3M and MOD player library developed by Robert J Ohannessian,
Julien Cugnière and me, Ben Davis. XMMS, Beep Media Player and Winamp 2.x/5.x
plug-ins are available on this site too.

Here is the statutory feature list for DUMB:

Freeware
Supports playback of Impulse Tracker (IT), Scream Tracker 3 (S3M), Fast Tracker
2 (XM) and Amiga Module (MOD) files
Faithful to the original trackers, especially IT; if it plays your module
wrongly, please tell me so I can fix the bug! (But please don't complain about
differences between DUMB and ModPlug Tracker)
Accurate support for low-pass resonant filters for IT files
Very accurate timing and pitching; completely deterministic playback
Click removal
Facility to embed music files in other files (e.g. Allegro datafiles)
Three resampling quality settings: aliasing, linear interpolation and cubic
interpolation
Number of samples playing at once can be limited to reduce processor usage, but
samples will come back in when other louder ones stop
All notes will be present and correct even if you start a piece of music in the
middle
Option to take longer loading but seek fast to any point before the music first
loops (seeking time increases beyond this point)
Audio generated can be used in any way; DUMB does not necessarily send it
straight to a sound output system
Can be used with Allegro, can be used without (if you'd like to make DUMB more
approachable to people who aren't using Allegro, please contact me at the
address in the documentation)
Makefile provided for DJGPP, MinGW, Linux, BeOS and Mac OS X
Project files provided for MSVC 6
Autotools-based configure script available as a separate download for masochists
Code should port anywhere that has a 32-bit C compiler; instructions on
compiling it manually are available in readme.txt