The best open source alternative to Reaper is LMMS, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Reaper and 16 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Reaper are Ardour (Freemium, Open Source), Rosegarden (Free, Open Source), Qtractor (Free, Open Source) and AudioMass (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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Ardour vs Reaper opinions
Most users think Ardour is a great alternative to Reaper.
Ugotsta Ardour is a very powerful and capable DAW, it's just tough to learn since practically all features are exposed at all times. Reaper provides an arguably faster workflow, has a similarly powerful mixer and incidentally installs and loads faster than nearly every other modern DAW.
AudioMass lets you record, or use your existing audio tracks, and modify them by trimming, cutting, pasting or applying a plethora of effects, from compression and paragraphic equalizers to reverb, delay and distortion fx.
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.
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.