GoatTracker is a cross-platform tracker written by Lasse Öörni, producing SID chiptune music for the Commodore 64, and released with source code under the GPL. It is notable for being possibly the only SID chiptune-composer NOT native to the C64, as many alternative composers (including JCH, and CyberTracker) only execute on the C64 or inside C64 emulators. Many SID tunes are available in various formats on the Internet, especially through the High Voltage SID Collection (HVSC). GoatTracker is capable of directly exporting to the .sid (PSID/RSID) file format in addition to standard C64 PRG files.
This Mac OS X port of GoatTracker integrates the cross-platform code with a standard Mac OS X GUI, and adds additional features, such as MIDI keyboard support and comprehensive built-in help.
Versions of GoatTracker for other operating systems such as Windows and Linux can be found on the Covert Bitops page.