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Tunefish 4

Tunefish 4 is an additive/wavetable software synth.

8 Alternatives To Tunefish 4

Dexed

Dexed is a multi-platform, multi-format plugin synth that is closely modeled on the Yamaha DX7.

Helm

The Kubernetes Package Manager
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Oxe FM Synth

Oxe FM Synth is an open source VST 2.4 instrument plugin for Windows, Linux and Mac OS X.

Surge Synthesizer

Open-source subtractive-hybrid synthesizer formerly sold commercially as Vember Audio Surge.

Synth1

Synth1 is a software synthesizer. Functionally it is modeled on the Clavia Nord Lead 2 Red Synth.
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ZynAddSubFX

ZynAddSubFX is an open source software synthesizer for Linux, Mac OS X and Microsoft Windows.

padthv1

An old-school polyphonic additive synthesizer

synthv1

A polyphonic synthesizer