opensourcevst.com

Open-source modular synths

3 projects, each with its formats, systems and licence

Virtual modular systems let you wire oscillators, filters and sequencers together as if they were hardware. One is a standalone app with a very large community library, and the other packages the same engine as a plugin for your DAW.

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Format

Activity

VCV Rack logo

VCV Rack

GPL-3.0Quiet

A virtual Eurorack modular synthesizer with a huge library of community modules, from classic oscillators and filters to sequencers and effects.

Formats
  • Standalone
Works on
  • Windows
  • macOS
  • Linux
Stars4.4k
UpdatedNov 4, 2025
Cardinal logo

Cardinal

GPL-3.0Active

The VCV Rack modular environment packaged as a plugin, with a large bundle of modules, so you can patch a whole modular system inside your DAW.

Formats
  • VST3
  • CLAP
  • AU
  • LV2
  • Standalone
Works on
  • Windows
  • macOS
  • Linux
Stars3.2k
UpdatedJul 28, 2026
Instead ofReaktor logoReaktor
plugdata logo

plugdata

GPL-3.0Active

Wraps Pure Data as a plugin with a visual patching editor, so you can build your own instruments and effects by connecting objects.

Formats
  • VST3
  • LV2
  • Standalone
Works on
  • Windows
  • macOS
  • Linux
Stars2.4k
UpdatedNov 3, 2026

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