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ZynAddSubFXSurge XT
Freemium

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

 Free

Free and open source.

Windows, macOS, Linux Windows, macOS, Linux
  • Three synthesis engines including PAD synthesis
  • Wide choice of filters and free-form envelopes
  • Many synthesis methods, filters and effects
  • MPE and microtuning support
  • Ready-made Zyn-Fusion binaries are paid
  • Deep parameter set takes time to learn
  • Large feature set takes time to learn
Downloadable app Downloadable app
Open source Open source
License: GPL-2.0 License not stated
No account needed No account needed
Works offline Works offline

Checked October 2, 2026

Checked September 23, 2026

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