Apps similar to Serum include Vital, which is open source with a free version. Other options are Helm, ZynAddSubFX, Waveform synth and Odin 2. You can choose from more than 10 Music Production Apps like Serum for Windows, Mac, Linux, iPad and iPhone.
Vital is a spectral warping wavetable synthesizer with drag'n'drop modulation workflow and animated preview of the synth's inner workings where needed. Comes with many modulation sources (including audio-rate), MPE support and FX chain.
United States
Helm is a free, cross-platform, polyphonic synthesizer with a powerful modulation system. Helm runs on GNU/Linux, Mac, and Windows as a standalone program or LV2/VST/VST3/AU plugin.
United States
ZynAddSubFX is a fully featured open source software synthesizer capable of making a countless number of instruments, from some common heard from expensive hardware to interesting sounds that you'll boost to an amazing universe of sounds.
Romania
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Waveform is a free, open-source wavetable synthesizer that runs entirely in the web browser, built on the Web Audio API. There is nothing to install and no account to create: open the page and play with the on-screen piano, your computer keyboard or a MIDI controller.
Odin 2 is a versatile 24-voice polyphonic synthesizer that covers about every type of synthesis out there. Odin 2 is released as open-source software.
GermanyEU
Dexed is an FM-type softsynth developed by Pascal Gauthier of Digital Suburban. It is an ideal application for importing, playing and editing/managing sysex patches from both the classic Yamaha DX7 synthesizer and the TX7.
FranceEU
Surge is an open source digital synthesizer originally written and sold as a commercial product by @kurasu (Claes Johanson) at Vember Audio. The synth uses subtractive hybrid synthesis and each patch contains two 'scenes' which are separate instances of the entire...
United States
Movement in nature has inspired us for centuries. And now, the sounds of movement in nature have inspired a new instrument that will put you into a creative state of flow.
South Korea
The NES VST is designed to emulate the 8-bit sounds of the Nintendo, remaining faithful to the specifications of the 2A03 chip.
United States
Omnisphere is the flagship synthesizer of Spectrasonics® - an instrument of extraordinary power and versatility. This award-winning plugin brings many different types of synthesis together into one amazing-sounding instrument that will inspire a lifetime of exploration.
United States
A virtual analog synthesizer, Tunefish v4 was developed as a smaller replacement of Tunefish v3 with roughly the same power - some might argue it's even more powerful. It was also ported over to Linux and MacOS and was given a new polished UI.
Synth1 is a software synthesizer modeled on the Clavia Nord Lead 2 Red Synth. It combines the common sound synthesis method of Subtractive & FM synthesis.
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