Qtractor is an Audio/MIDI multi-track sequencer application written in C++ with the Qt framework. Target platform is Linux, where the Jack Audio Connection Kit (JACK) for audio, and the Advanced Linux Sound Architecture (ALSA) for MIDI, are the main infrastructures to evolve as a fairly-featured Linux desktop audio workstation GUI, specially dedicated to the personal home-studio.

KXStudio is a collection of applications and plugins for professional audio production.
KXStudio provides Debian and Ubuntu compatible repositories and its own Linux Distribution currently based on Ubuntu 14.04.5 LTS.

SuperCollider is a platform for audio synthesis and algorithmic composition, used by musicians, artists, and researchers working with sound. It is free and open source software available for Windows, macOS, and Linux.

Dexed is a multi platform, multi format plugin synth that is closely modeled on the Yamaha DX7. Dexed is also a midi cartridge librarian/manager for the DX7.

Full documentation for sequencer64, a loyal fork of seq24, now including native JACK MIDI in v. 0.90.0.

A major reboot of Seq24, with new features and bug fixes. Current release is 0.93.0, native JACK MIDI and ALSA, important bug fixes, new features "multi-wid" and "varisets", better support for Meta events.

Seq24 is a minimal loop based midi sequencer.

It was created to provide a very simple interface for editing and playing midi 'loops'. After searching for a software based sequencer that would provide the functionality needed for a live performance, such as the Akai MPC line, the Kawai Q80 sequencer, or the popular Alesis MMT-8, I found nothing similar in the software realm. I set out to create a very minimal sequencer that excludes the bloated features of the large software sequencers, and includes a small subset of features that I have found usable in performing.

Let's make music

with a free, cross-platform tool for your computer.