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ZynAddSubFXOB-Xf
Freemium

Source code is free; the Zyn-Fusion binary release is pay what you want from $45.

 Free

Free open source plugin maintained by the Surge Synth Team.

Windows, macOS, Linux Windows, macOS, Linux
  • Three synthesis engines including PAD synthesis
  • Wide choice of filters and free-form envelopes
  • VST3, CLAP, AU and LV2 formats
  • Builds for Windows, macOS and Linux, including ARM Linux
  • Ready-made Zyn-Fusion binaries are paid
  • Deep parameter set takes time to learn
  • Needs a compatible plugin host or DAW
  • Recommends 8 GB of RAM or more
Downloadable app Downloadable app
Open source Open source
License: GPL-2.0 License not stated
No account needed Not stated if an account is needed
Works offline Works offline

Checked October 2, 2026

Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.