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Surge XTZynAddSubFX
Free

Free and open source.

 Freemium

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

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

Checked September 23, 2026

Checked October 2, 2026

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