DefleMask is a cross-platform multi-system music tracker.  It has it's own save format .dmf and is also capable of exporting various chipmusic formats.

YAMAHA SMAF-MA2 YMU759
SEGA Genesis/Mega Drive
SEGA Master System
Nintendo Game Boy
NEC PC-Engine/TurboGrafx-16
Nintendo Entertainment System/Famicom 

Currently available for Windows & Linux
(a Mac version is also being developed) 

Download from the website --
http://delek.com.ar/deflemask