List of Trackers for Mac and iOS

Mac OS Classic

 * MacMod Pro
 * MilkyTracker
 * PlayerPRO  (open source; no longer being developed)
 * Sound Trekker (Latest version 2.2; development discontinued)

Mac OS X

 * CheeseTracker
 * ChibiTracker
 * Frinika
 * LittleGPTracker
 * MilkyTracker
 * PlayerPRO
 * ProTrekkr
 * Psycle
 * Renoise
 * Schism Tracker
 * SunVox

iPhone

 * SunVox

Cross-platform

 * GoatTracker (SID sound chip, Commodore 64)