The best open source alternative to LMMS is Ardour, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to LMMS and 18 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to LMMS are Rosegarden (Free, Open Source), Qtractor (Free, Open Source), Carla (Free, Open Source) and FamiStudio (Free, Open Source).
Ardour is a hard disk recorder and digital audio workstation application. It runs on GNU/Linux, Mac OS X, and Windows. Ardour's intention is to provide digital audio workstation software suitable for professional use.
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Almost everyone thinks Ardour is a great alternative to LMMS.
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.
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.
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.