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 
Commodore 64 (MOS Technology SID 6581. MOS Technology SID 8580)

Currently available for Windows, Linux and Apple OS X

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