CheeseCutter is a tracker program for composing music for the SID chip created by Abbadon. It uses the reSID engine for SID emulation. The packed files can be played on a real C64.
It was first inspired to be fully compatible with JCH Editor on C64 but in version 2.x JCH compatibility was dropped completely. Featurewise, CheeseCutter is on par with programs such as SDI (SID Duzz' It) and GoatTracker 2.
Download from CheeseCutter's homepage