Amazing free Synthesizer plugins for PC & Mac are probably the best deal I can mention because you get a 100% OFF discount. I picked out the best 5 free Synthesizer plugins in my opinion that you need to check out.
They range from virtual analog, FM, wavetable… so something for every taste or just download them all.
TAL-Noisemaker Synthesizer v4
One of the best sounding and best-known free Synthesizer plugins on the market is the Togu Audio Line TAL Noisemaker Synth v4. He may not be missing in any free hit list because it’s a perfect synth for great basses, leads and more.
It features a 6-voice synth engine with 3 oscillators with advanced shaping options (PM, FM, sync, ring mod), self resonating 4x oversampled filters 2 ADSR envelopes and 2 LFO’s.
Further, it offers velocity control, a one-pole HP filter, different built-in effects (Juno chorus, reverb, delay, bit crusher) and 256 professional designed presets.
More information here: Togu Audio Line
U-he Tyrell N6 Synthesizer
Another free synthesizer that should not be missed is the Tyrell N6 Synthesizer by U-he. It was developed in collaboration with the German online magazine Amazona.de and the final result is amazing. Tyrell N6 features a virtual analog architecture with two oscillators, noise and ring modulator.
The signal is routed then in an audio source mixer which goes then in a twin filter based on an early model of Diva Synthesizer that offers authentic overdrive and filter feedback.
Further, you have two full ADSR envelopes, 2 sync-able LFOs with 8 waveforms and over 580 factory libraries. On several other sites, there are many excellent free presets available. U-he Tyrell N6 is an absolute must-have synth if you love rich analog-inspired sounds.
More information here: Tyrell N6
Dexed – FM Synthesizer Plugin
If you like FM Synthesis you can not miss the free FM Synthesizer Dexed that is closely modeled on the Yamaha DX7. The goal of this project is to be a tool/companion for the original DX7. Besides a complete recreation of the DX7 engine, it offers 144 DAW automatable parameters available from one single panel.
One big highlight of the Dexed Synthesizer is the full support for DX7 input and out Sysex messages including controller change. This means that you can use this with a native DX7/TX7 as a patch editor and SysEx manager.
It can load/save also DX7/TX7 Sysex programs and one thing is certain: there are thousands of free DX7 sounds available as a free download. So you can use Dexed as a patch editor but also as a complete FM Synthesizer plugin. A must-have if you love FM-synthesis.
More information here: Dexed
Full Bucket Music ModulAir Modular Polyphonic Synthesizer
Modular synthesis without cable clutter is possible and even for free. ModulAir is a modular 64-voice polyphonic software synthesizer for PC & Mac by Full Bucket Music.
Currently, it offers 51 different modules (oscillators, filters, modulation, sequencer…) that give you endless possibilities.
The constant updates are highly creditable here. The developer regularly releases updates with new modules and functions. Since there are no cables, the operation is a bit more special at first, but you can find your way in quickly. You love to discover new modular synths for free, go for it.
More information here: Full Bucket Music
Surge
The best comes last. Surge, formerly a payware Synthesizer plugin, is now open-source and free. The amount of high-quality and versatile function can not be found in any other free synthesizer plugin. Surge is a monster free synth plugin: 3 oscillators with 8 OSC algorithms, OSC FM & ring mod, noise generator, two filter units with 8 different configurations and 5 different waveshapers.
On the modulation side, it features 12 LFO’s (6 per voice, 6 global) including 7 deformable LFO waveforms + drawable/step sequencer waveform and a DAHDSR envelope generator on every LFO,
To refine the sounds, it comes with 8 effect unit that includes 10 top-quality algorithms. On top, you get over 1000 presets that gives you instant new sounds. An absolute beast of a synth plugin that cost you nothing.
More information here: Surge