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.
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.
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...
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).
Luppp is a music creation tool, intended for live use. The focus is on real time processing and a fast, intuitive workflow. With extensive MIDI mapping support, you can get looping just how you like!
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.
LinuxSampler - free, open source pure software audio sampler with professional grade features.
16-bits FastTracker is a clone of the infamous DOS tracker but made for modern computers with a GPU and CPU and monitors with 60Hz refresh rate.
Hydrogen is an advanced drum machine. It's main goal is to bring professional yet simple and intuitive pattern-based drum programming.
Reason is a virtual studio rack with all the tools and instruments you need to turn your ideas into music. And it's more than just a set of excellent synths and effects. It's a complete music system. Step into the age of Reason.
Frinika is a free (licensed under GNU GPL) complete music workstation software containing sequencer, midi support, soft synthesizers, audio recorder, piano roll/tracker/notation editing and more. The goal of Frinika is to be a complete platform for making music with your...
BassoonTracker is a web-based, mod music tracker in JavaScript. It plays and edits 4-channel Amiga Mod files.
Bosca Ceoil is all about looping, and designed that way at its heart. Songs are built up from lots of tiny 16 note patterns – the intended workflow is that you loop over these single patterns until you have something you like, then you start making variations.
A modular system composed of four main parts: Non Timeline, a non-destructive, non-linear audio recorder and arranger. Non Mixer, a live mixer with effects plugin hosting and advanced Ambisonics spatialization control.
Mb Launchpad is the first Linux launchpad. Available for Linux, MacOS, Android (executables) and for Wdos if you compile it.
Carla is an audio plugin host, with support for many audio drivers and plugin formats. It has some nice features like automation of parameters via MIDI CC (and send output back as MIDI too) and full OSC control.
Cross-platform DAW for multitrack audio and MIDI recording, editing, mixing, mastering, scriptable automation, plugin support, and customizable workflow.
