OpenMPT (short hand for Open ModPlug Tracker) is a popular tracker software for Windows. OpenMPT is completely free and allows you to create and play back some great music on your computer. Based on the original ModPlug Tracker written by Olivier Lapicque, OpenMPT is free...
FamiStudio is very simple music editor for the Nintendo Entertainment System or Famicom. It is designed to be easier to use than FamiTracker, but its feature set is also much more limited. It is targeted at both chiptune artists and NES homebrewers.
SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker). It is a tool for those people who like to compose music wherever they are, whenever they wish. On any device.
Schism Tracker is a free reimplementation of Impulse Tracker, a program used to create high quality music without the requirements of specialized, expensive equipment, and with a unique "finger feel" that is difficult to replicate in part.
MilkyTracker is an open source, multi-platform music application for creating .MOD and .XM module files. It attempts to recreate the module replay and user experience of the popular DOS program Fasttracker II, with special playback modes available for improved Amiga ProTracker...
A multi-system chiptune tracker compatible with DefleMask modules.
Furnace Tracker vs DefleMask opinions
It's better than DefleMask. (also it's free and open source)
The ultimate and true multi-platform chiptune tracker. Cross-platform free and open source!
It does roughly the same things of Deflemask, and supports much more sound chips.
Free and open-source multi-system chiptune tracker with better emulations (Nuked, reSID etc), and the dev have better understanding on chiptune
Renoise is a contemporary digital audio workstation (DAW) based upon the heritage and development of tracker software. Its primary use is the composition of music using sound samples, soft synths, and effects plug-ins. It is also able to interface with MIDI equipment.
Prototracker is a fakebit chiptune tracker that uses a single-oscillator synth with 256 preset waveforms. Macros are used to create instruments and keyboard shortcuts are similar to the familiar Protracker.