Klystrack is free AND open source (an AHX style tracker)

Sunvox is free for all desktop platforms (a buzz style tracker)

I forgot about SunVox, which is also available (paid app) on iOS (and Android, I think)...

Did u tried it on a PDA, back in the day?

Sunvox is free for all desktop platforms (a buzz style tracker)

Renoise is actually free for everything apart from rendering audio to disk, but you know this already File sharing has been encouraged more lately (instruments, songs, themes, fx chains). Of course if you use VSTs that complicates sharing.

ShcismTracker is a free implementation of Impulse Tracker

All of these are multiplatform I think.

There is no standard file format to be shared though.

http://jeskola.net/buzz/

For a pianoroll tracker with unlimited channels + .wav and custom waveform support, pxtone: http://studiopixel.sakura.ne.jp/pxtone/
Try the pxtone collage collective for some tracks: http://pxtone.haru.gs/english/

Here's some stuff I've used

• Qtractor, a decent piano roll sequencer: http://qtractor.sourceforge.net/qtractor-index.html I'll use this when I want to export a MIDI from something I've written in renoise

• Seq24, another piano roll sequencer, but focused on creating smaller loops that you build a song from http://www.filter24.org/seq24/ Never wrote anything in here, but I actually use this to practice instruments by making little loops I play along with

• Alib Tracker, a tracker of OLP3 http://www.adlibtracker.net/ I've written one song in this, pretty good

Plugins:

• Calf plugins, bunch of stuff, I use them to master http://calf-studio-gear.org/

• Hexter, DX7 emulator: http://dssi.sourceforge.net/hexter.html

• Qsynth, SF2 module: http://qsynth.sourceforge.net/qsynth-index.html

• Whysynth, really powerful synth, my go-to if I need some synth noises: http://smbolton.com/whysynth.html

• JAMin, a tool for mastering http://jamin.sourceforge.net/en/about.html I used to use it but I've since switched to calf tools for everything

Drums:

• Hydrogen, a drum machine http://www.hydrogen-music.org/hcms/ I've never written music in it, but I'll use it like a module, I'll pipe midi into it to use their sample packs, which can be pretty good

All of the above mostly use Jack, which I recommend: http://www.jackaudio.org/
I use qjackctl to connect all my jack devices: http://qjackctl.sourceforge.net/

- Milkytracker, a contemporary Fast Tracker II clone available for all major platforms (win,mac,linux... and Android!). It supports the old Amiga MOD format, Impulse Tracker's IT and XM. It's a little bit limited compared to modern things like Renoise (which is excellent and quite affordable, but propietary).

- LittleGPTracker: another tracker with an interface almost identical to LSDJ, but handles WAV samples and decent polyphony. Along with all desktop systems, it runs in the PSP, the GP32, the Dingoo and some other handhelds.

- NitroTracker, a tracker for the Nintendo DS, with no effects, but extremely portable. I use it for sketching some songs on the go

That's what it comes to trackers.

P.S.: The Ardour open source DAW is worth checking, also, but I'm quite unexperienced on it. I've seen some people here using LMMS on Linux (kinda public FLStudio)

Will add some as soon as they come to mind

Cheers!

What *decent* music software is out there that is at least free, if not open for the use in the creation and sharing of compositions?
Thoughts?