Apps similar to SidTracker64 include Bintracker, which is free and open source. Other options are DefleMask, GoatTracker, WebSID and JITT64. In total there are six Music Production Apps like SidTracker64 for Windows, Linux, Mac, the web and Android.
Bintracker is an advanced, cross-platform chiptune music editor. Bintracker supports many different sound routines on a wide range of 8-bit and 16-bit systems as it uses Mame as an emulation backend. So you can compose for SID, AY, FM, Beeper..
This is a crossplatform C64 music editor. Supports output via Dag Lem's reSID engine, the HardSID 4U USB device & HardSID soundcards or CatWeasel MK3.
An homage to the Commodore 64's SID sounds, WebSID is a Chrome experiment emulating the sounds of the classic C64 sound chip complete with MIDI support.
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JITT64 (Java Ice Team Tracker) is a tool for creating music with the SID chip used in the Commodore 64. This tracker is for making music without using low raster time, but instead gives you a possibility to make very complex instrument definition.
ChibiTracker is not currently in development but downloads are still available from Freecode (http://freecode.com/projects/chibitracker) & SourceForge (https://sourceforge.net/projects/chibitracker.berlios).
