Low end basic stuff: http://www.madtracker.org/main.php http://sourceforge.net/projects/modplug http://www.buzzmachines.com/
High end software: http://www.steinberg.de/Steinberg/defaultb0e4.html http://www.apple.com/logicpro/ http://www.digidesign.com/
High end software: http://www.steinberg.de/Steinberg/defaultb0e4.html http://www.apple.com/logicpro/ http://www.digidesign.com/