GVST

GVST’s plug-ins (by Graham Yeadon) are designed by to be simple, light-weight and efficient, although some are more ambitious and some more experimental and include amongst others a Chorus, Compressor, Delay, Gate and several Filter effects.

https://www.gvst.co.uk/index.htm

Buzz Cut

Buzz Cut is an audio clipping plugin designed for ease of use and great sound. The intuitive scrolling waveform display gives a clear visual depiction of the processing and makes the settings easy to dial in. The “HQ” mode offers a cleaner sound for when hard, digital clipping produces too many artifacts. While mixing, Buzz Cut works great for leveling off drums and percussion while retaining the impact of the transients. In a mastering context, clipping with Buzz Cut can allow the perceived volume of the audio to be increased without raising the peak levels.

https://www.gmhaudio.com/buzzcut

A1StereoControl

With my A1StereoControl plugin you will be able to expand or limit the STEREO WIDTH of your tracks using only one single knob. This powerful technique can be used on single tracks or groups tracks while mixing or even on a master bus in final mastering situations.
As many experienced mixing & mastering engeneers worldwide are complaining, stereo-expansion can have unwanted side-effects. Especially the bass frequencies should normally be simple mono.
As you may guess, my plugin has also a solution for this problem. The integrated "Safe Bass" algorithm centers all bass frequencies below a adjustable value right back into the middle of the stereo field. This gives your tracks the solidity and definition you want while preserving maximum transpancy and sharpness. Similar techniques were used by professional studio producers over ages
with either expansive hardware devices like elliptical equalizers or even advanced m/s-processors. With my plugin you will be able to manage this complicated task with a minimum effort.

http://www.alexhilton.net/A1AUDIO/index.php/a1stereocontrol

Vocal King

Vocal King Plugin: Dynamic effect guaranteed to help instruments or vocals sit in the mix! Used in several studio's around the world. One of the best character compressors!

• The pres compressor knob is the main work horse of the Vocal King. Turning the pres knob up turns up the gain and brings out the presence in the vocal along with giving it a smooth compression. Low cut, tighten, and bass works with the pres compressor to help take out the mud without making the vocal sound too thin. The crispy knob give highs some sparkle that many will find satisfying. Final compressor gives that extra compression to the vocal to make it sound thick. DB output turns the volume down. Use the power switch to quickly hear the difference between dry and processed. A, B, C, D, modes, I will let you find out what that means. The meters show gain reduction after signal is past 0db.

VK-2knob: The simple version of Vocal King. Great for compression any signal.

jParaComp: A dedicated stereo/parallel compressor.

jEq15Comp: Easy EQ the sound with the 15 band graphic equalizer. Afterwards, compress the signal.

https://www.jhudstudio.com/paid-plugins

Verberate

The free Verberate Basic is based on Verberate 2 and offers the same highly praised audio quality. The plug-in offers four high quality presets from Verberate 2 that showcase the quality and versatility of the algorithm:

Plate, a realistic simulation of plate reverb with the typical frequency dispersion and decay properties that give plate reverb the airy touch
Room, a beautiful and warm wooden room that gives a great sense of room without being obtrusive
Hall, a natural and gorgeous sounding hall
Lush Hall, a colorful out-of-world hall with frequency modulated tails that sounds amazing on synth pads
The intuitive user interface has buttons for each of the four reverb programs along with a mix knob that let’s you adjust the dry and reverb signal levels.

https://acondigital.com/products/verberate-basic/

e-phonic XPressor

Add some warmth to your mix
XPressor is a high quality saturation and dynamics processor. It's capable of making your drums, vocals and instruments stand out in a mix. From subtile warm saturation to overdrive, XPressor adds that extra touch.

Soft clip, hard clip and wavefolder algorithms
Built in dynamics processor
Low and high cutoff filters
Up to 8 times oversampling

http://www.e-phonic.com/xpressor.html#/

Signal Noise SN01-G Compressor

SN01-G was inspired by two classic VCA buss compressors of UK and US variety to provide a musically pleasing buss glue, or smash (laugh), while also being an efficient channel insert with low ASIO/CPU footprint. Sonically, it ranges from almost opto-like smoothness up to true hard-knee brick wall limiting."

• feed-forward topology with linked channels.
• standard controls for threshold, ratio, gain, and envelope.
• adjustable width and strength of the knee.
• dry/wet control for parallel compression.
• 2 optional filters for internal side-chain.
• optional 'push' effect for more extreme compression.
• no saturation modelling.

https://senderspike.wordpress.com/2019/11/12/sn01g/

Clarinetica

Clarinetica is a virtual analog clarinet module that uses 4 independent 32-bit waveforms with high dynamic range to generate four ethnic clarinet emulations, each with its own size and color; Bass clarinet, classic east-European Klezmer clarinet, medium Caucasian clarinet (Kavkaz) and classic west European clarinet (Vienna).

Clarinetica has a full synthesis section, two different MIDI velocity options, a global hi/lo-pass filter, a full section of built in effects (saturation, chorus, phaser, tremolo, reverb and delay), built-in draw-bars system and full automation.

https://www.fananteampro.com/

GB DrumBox

 GB DrumBox, a Game Boy virtual instrument.

GB DrumBox is a result of a collaboration between Bedroom Producers Blog and SampleScience. The plugin was developed by SampleScience, using a set of authentic Game Boy audio samples that were recorded by Bedroom Producers Blog.

GB DrumBox contains twelve drum kits, each with a set of eight Game Boy samples. The user can adjust the volume, pan, and decay time for each channel. The filter cutoff, reverb level, attack time, and modulation are applied globally. The plugin also offers multi-out functionality. If multiple outputs are used, the global filter and reverb effects will turn off automatically.

https://bedroomproducersblog.com/2019/11/14/gb-drumbox/

Roger Schult W2395C Baxandall EQ

The W2395c is a classic Baxandall EQ combined with a powerful and beautifully sounding mid band. As solitary or complementing equalizer with that special something, its particular tone and slightly interactive bands let your tracks stand out big time. 

https://fuseaudiolabs.com/#/pages/product?id=300965965

Oberom

Oberom is a sampled version of Oberon by Land of Cockaigne, a VST plugin that is an attempt to imitate the classic analog polysynths. With its thick 2-pole dual filter, it's sound is reminiscent of the Arp 2600.

Oberom comes with the original 16 sounds. They have been sampled to be faithful copies of the presets that came with Oberon. Oberom is a must-have if you produce synthwave, synth-pop, vaporwave, and any other 80s influenced genres.

https://www.samplescience.ca/2019/10/oberom.html

Xylo Wood

The Xylo Wood VST Plugin was designed from a real authentic wooden xylophone which is located at a local museum. My daughter and I sampled it to bring to music makers across the globe an awesome free tool! The Xylo Wood consist of 3 different layers that we can dial in and blend each layer with one another to create a sick wooden xylophone sound. Xylo Wood also has some essential effects such as reverb, envelopes such as attack, decay sustain, and release. 

https://reflektaudio.com/product/xylo-wood/

Devil soundz

Devil
Devil is a two oscillator analog subtractive wave table synthesize

Devil Bass Module
3 oscillators. The first oscillator is for the low basses the second oscillator is for mid basses and the third oscillator is for high basses.

Devil Drummr
Devil Drummr is a drum sampler that loads 16-bit wav files and has 11 parts. One part for each of bass, kick, snare, tom low, tom high, hi hat, cymbal and clap. Devil Drummr also has three extra parts for adding different instruments whether it be a triangle, bell, conga, shaker or sound fx or whatever you want.

Devil Reverb
Devil Reverb is a great sounding reverb for adding that extra melody and warmth to your instrument.

Vocal Reverb
Vocal Reverb works seamlessly with your vocals. Vocal Reverb has that perfect ambiance, tone and harmonics to match your vocals whether you have a real deep voice to a really high voice. Vocal Reverb doesn't have any after tone (or tail) either. So you can program Vocal Reverb to sound just like your voice while Vocal Reverb adds just that right amount of ambiance, tone and harmonics to your vocals.

https://www.devilsoundz.com/

Kairatune

Kairatune Synthesizer
It’s designed to produce crisp and tight electric sounds for electronic music production. Kairatune is engineered for the demanding producer who needs to push the sound to extremes without compromising audio quality. Kairatune offers fast and intuitive sound design workflow. The user interface is designed for a musician rather than an engineer and is based on the concept of pitch and beat in contrast to frequency and time. Kairatune lets you travel in the world of beats, notes and intervals instead of the logarithmic mathematics of frequencies and the rarely useful absolute time.
Kairatune is not your all-in-one synthesizer. It’s designed and engineered to be as powerful and versatile as possible in it’s target role as your source for tight bass, unique lead and shiny SFX sounds. At the same time it makes all the effort to be simple enough to use, enabling you to add your personal touch and flavor to the sound and seek for the perfect fit to your mixing preferences.

http://futucraft.com/kairatune/

Digital Systemic Emulations Syncla-X Synthesizer

Syncla-X is an emulation of the Synclavier FM unit and is available for PC & Mac.

The first free emulation of the Synclavier FM Unit... Extended.

4 Carriers, 4 Modulators

8 Harmonics generator

8 ADSR + 2 ADSR

Individual Pans

Velocity

Filter

Mono/Poly modes

2 LFOs

Flanger and bitdepth

https://sites.google.com/site/digitalsystemic/home/syncla-x?authuser=0

Viking synthesizer

VK-1 Synthesizer is an authentic emulation of a classic monophonic analog synthesizer. It has three continuously variable wave oscillators, two ladder filters with a Dual Lowpass or Highpass/Lowpass configuration, a multi-wave LFO, and two modulation busses. VK-1 uses state of the art DSP technology to accurately reproduce the sound of the hardware.

VK-1 comes with 228 presets in the categories Bass, Bright Lead, Electro Bass, FX, Percussive Lead, Soft Lead, and Synthwave. The 50 Electro Bass and 50 Synthwave presets were created by experienced sound designer eXode. The synth excels at thick bass and rich lead sounds.

https://blamsoft.com/vst/vk-1-viking-synthesizer/

Noise Makers Siren Synthesizer

Noise Makers Siren is a free synth for psychedelic dub effects.

https://www.noisemakers.fr/siren/

PAPU & ither 8bit synths

PAPU Synthesizer
It’s a new 8bit synth for PC/Mac
Emulates hardware of Nintendo Gameboy

SN76489 Synthesizer
This virtual instrument is a free VST/AU 8bit synthesizer that emulates the Texas Instruments SN76489 of the Sega Master System and other.


Voc Synthesizer emulates glottis and shape of vocal tract. 
Constrict oral cavity to change sound.


RP2A03 emulates Ricoh 2A03of the NTSC Nintendo Entertainment System.


Commodore 64 SID  emulates MOS Technology SID of the Commodore 64


https://socalabs.com

Noisetar

Noisetar is a synthesizer dedicated to the generation of many different noise based sounds.

The generation is purely mathematical, no samples or wavetables are used, thus allowing for an easy continuous morphing from one sound to the other. Twelve parameters control the generator, moreover its output can be further shaped and enriched inside Noisetar with its two filters, a chorusing reverb and a stereo enhancer. As modulators Noisetar offers an ADSR envelope and keytracking, with seven destinations.

Using the included bandpass filter, which is tuned to the incoming MIDI notes, is also possible to play Noisetar melodically.

Noisetar is designed with DAW parameter automation in mind to tailor complex custom modulations tied to each project rather then dealing with complicated patches.

Noisetar has its own sound space, ranging from various digital noises to crackle, rattles and crepitations similar to wood fire or rain, scratchy percussions and foot stomps, with many others from the lowest booming and gurgling drones, to thin misty hisses. The quality and types of Noisetar sounds obviously doesn't cover all possible noise sounds, but most certainly will increase your noise arsenal without taking up more than 2MB on your drive.


Effects:
12dB/octave, low pass and high pass.
Chorusing Reverb.
Stereo Enhancer.
Others:

Tooltips on screen.
Resizable GUI.
Custom colours and texture.

http://nusofting.nusofting.com/noisetar/noisetar.html

RealSpread

Truality Audio has released RealSpread, a free VST plugin that widens a sound source.

RealSpread "Stereoizes" a mono audio signal or widens a stereo one, without practically compromising mono compatibility. The spartan GUI conforms to RealSpread's philosophy of simplicity in plugin design.

RealSpread is more effective on single sources, for example a single (mono) Drums Overhead or Room microphone. Of course, you can experiment with stereo sources.

https://trualityaudio.weebly.com/free-vst-plugins.html

ProjectSAM has released Dystopian Drones, another addition to The Free Orchestra series of free cinematic orchestral libraries for Native Instruments Kontakt.

The library comes with a customized Kontakt user interface with adjustable attack and release times, low-pass filter, distortion, reverb, and a limiter. The user can also apply the optional master equalizer and octaver effects. As for the included drone sounds, the library comes with seven drone samples in total, each around a minute long. The samples are mapped across the keyboard, with each drone sound being stretched across an octave.

The instrument isn’t very versatile, but it does indeed deliver some rather exciting dark cinematic tones. For music producers who want to add a darker vibe to their project, these sounds could be well worth checking out. The source samples are top quality and they can be tweaked to your liking using the built-in effects. Users who don’t own NI Kontakt can load the included drone samples in any sampler instrument capable of loading WAV files.

https://projectsam.com/libraries/tfo-8-dystopian-drones/

SQ8ROM

SQ8ROM is a free rompler virtual instrument offered in VST, VST3, and AU plugin formats for compatible digital audio workstations on PC and Mac. It is a sample-based recreation of the legendary Ensoniq SQ-80 hardware synthesizer. The SQ-80 was the successor of the much-beloved SQ-1 keyboard, featuring 41 additional waveforms and various hardware improvements. Similar to its hardware counterpart, SQ8ROM is a fantastic source of lush 80s-style pads, vintage leads, and warm bass sounds.

The instrument comes with 168 multi-sampled patches. These are all clearly labeled and easily accessible through the plugin’s preset browser. The source sounds can be tweaked using SQ8ROM’s volume envelope and LFO modulation controls. A built-in reverb is also included, courtesy of the MaizeSampler platform which was used as the framework for developing the plugin.


https://www.samplescience.ca/p/sq8rom-download-page.html

Fanan Monica

Monica, a dual-layered monophonic synth with 2 completely different oscillators. The first oscillator is wavetable based with 64 wavetables + additional 64 wavetables for morphing. The second is 32-bit waveform oscillators that emulates 90s monophonic synths.

Features:

• Osc 1 - 64 wavetables osc.+64 morphing wavetables.
• Osc 2 - 32-bit resolution osc. based on 90' EDM sound style.
• 3 mono playing styles.
• Portamento.
• Fixed MIDI velocity.
• Velocity limiter.
• Global hipass - lopass filter.
• Full synthesis section for each oscillator.
• Separate trance-gate arpeggiator for each oscillator.
• micro-tuner.
• mod. wheel controller.

https://www.fananteampro.com

XSRDO Analogy Modular Synthersizer

XSRDO Patchwork Modular System is a true modular synthesizer. You can choose what modules you want, where to put them and how many of them you want. Each module is independent of any other and only becomes active when you start to patch them together in your own creative way.

Features:

36 Virtual racks.
More than 50 modules.
Insert any module into any rack.
Insert multiple modules.
Movable modules.
Use of 3rd party wavetables and samples.
Load & Save preset programs.
Very low CPU usage.

- Added new switch to ARP module to select from 16 preset rhythms
- Polyphonic Padwave module
- Padwave Driver Module for pitch envelope mod, filter envelope mod, pitch mod etc...
- Added Slow/Fast option to Random/Noise Generator Module
- Added Slow/Fast option to Random/Noise Generator Module

https://xsrdo.blogspot.com

Misstortion 2

Distortion plugin

Does its best to be like Logic's Clip Distortion and adds a bunch of other great features, which makes it very useful for the Hardstyle genre.

- Symmetry: Make your waveform asymmetrical for more finetuned distortion.
- Hard clip: Simple hard clip distortion.
- Soft clip: Hyperbolic soft clip distortion.
- Resonance: Increase the resonance to get a great tonal sound.
- Bitcrush: Add some bitcrushing to your waveforms.
- DC Filter: Filter out that nasty DC offset quickly and efficiently.

https://nimble.itch.io/misstortion

LA school esquire limiter

The esquire limiter uses two algorithms to process sound; A standard "envelope" mode as well as a "pumping" mode which allows some very unique effects.

Designed to be fast and easy on the CPU; The envelope Mode uses at most 1.2% of Your CPU while the Pumping Mode 1.8 - 3.2%.

In pumping mode; at low threshold and ratio tolerances, the Esquire reacts much like a peak limiter in that it aggressively reduces volume. This however can be a great strength to create both effect and a more pleasing variety of normalization.

A smooth and sweet sound allows this limiter to be used at either the forefront in the master channel or track by track with little coloration and dissonance. Do be careful of the pumping mode however due to its intolerance of gain variance.

https://leattol.com/work/

LA bands 2 EQ

LA Bands - 15 Band Graphical EQ

The LA Bands EQ is one of the best free Equalizers on the internet. Carefully designed with 15 peaking EQ filters carefully calibrated to avoid dissonance, essing and clipping. Special thanks to flowstoners.com for Hosting and VST4Free.com for co-releasing.

https://leattol.com/work/

Belle Filter

Belle Filter is a simple recreation of the world’s most desirable console module.

- Based on the vintage Helios console module 
- Band-stop filter 
- rare Q factor

https://babelson.com/?v=04c19fa1e772

T-force Alpha Plus 2

Mastrcode Music has released T-Force Alpha Plus 2 - VSTi for Windows.

With all the features of the old Alpha Plus and plus new enhanced features:

New graphical user interface:
now you can change every single panel's background color individually in realtime while you have open the plugin inside your DAW.

Main Panel:
now i swapped the filter, filter envelope and also the amp envelope to the main panel instead of the modulations panel for better workflow. The distortion module now is in the effects panel.

New oscillator features:
Drift Mode: every single oscillator now has a "drift" mode. You can add a slight adjustable phase and/or pitch drift to simulate the voltage inaccuracies of a vintage analog synth.

Better envelopes:
Envelope curves for attack, decay and release now can be adjusted from linear to exponential.

New filter with up to 14 different filter types.

New designed LFO's:
the LFO's now can be switched to bipolar/unipolar
the start/triggering of the LFO's now can be delayed
the LFO's now have an attack mode for the LFO amount to let the modulation "fade in"

Enhanced Trance Gate:
new UI for better worflow
the gate sequencer now has 3 retrigger modes:
Host mode: the sequencer will be synced with the DAW's sequencer bars
1st Note: the gate sequencer will be triggered by the first played note (e.g. when playing chords).
All Notes: the gate sequencer will be triggered by every new pressed note.

Effects section:
new phaser effect added
new enhanced distortion/saturation effect
new bitcrusher model
completely new designed reverb effect
completely new designed delay effect.

Polyphony settings:
the overall polyphony can be changed manually by the user:
up to 1 - 128 voices
up to 0 -128 additional reseve voices (to have reserve voices for long env releases before they will be cut by new new played notes)
voice stealing modes:
hard steal, soft steal or overlap mode.

https://www.kvraudio.com/product/t-force-alpha-plus-2-by-mastrcode-music

ToneZ synthesizer

ToneZ is a virtual synthesizer designed specifically for EDM music production. It features four oscillators with twelve morphable waveforms covering a range of classic and less common waveform shapes.  The oscillators can be detuned and widened to generate fatter sounds suitable for use as EDM leads and pads. The synthesis engine features four envelopes with exponential and linear curves, two LFO generators with six waveform shapes, and a mod matrix for connecting the available modulation sources with different parameters.
The timbre can be shaped using two multi-mode filter units and six built-in effects. The effects cover distortion, chorusing, compression, delay, reverb, and equalization. ToneZ also features a built-in preset manager for saving custom patches or loading some of the free preset packs which can be downloaded from the product page on T0NIT0 RMX’s website. The synth comes with 30 presets out of the box.

https://t0nit0rmx.github.io/plugins/tonez

FiltR

FiltR is a filter effect with multiple filter modes based on the high quality filters from SynthR

It is easy to use and always 2x oversampled.
Interface is scalable and with a choice of several color sets.

http://gudaaudio.com

AnaMark

AnaMark is a 3 osc analog synth. 

• 545 Factory Presets.
• Generation of random Presets.
• Four part multi-timbral (mono-timbral mode available).
• Polyphonic (16 voices) and monophonic.
• 52 basic waveforms.
• 3 Modulatable oscillators with feedback and oversampling.
• Each OSC may use one of the basic waveforms or a combination of two, which leads to more than possible 2000 basic waveforms per OSC. 21 Types of synthesis (e.g. additive, ring modulation, FM, XFM, PM, etc.).
• Extended waveshaper.
• 8 modulatable filter types (Lowpass, highpass, notch, etc.).
• Additionally a filter-independent resonator.
• Modulation sources: High-flexible LFO, Envelopes and Combiners as well as MIDI-Events (Velocity, note, MIDI control changes, Aftertouch, etc.) and random.
• 11 Effects (Delays/Reverbs, Chorus, Flanger, Phaser, EQ); 2 Effects can be serialized.
• HighQuality-Function.
• All time-parameters/FX (e.g. modulation speed) can be fix or synchronized to MIDI.
• Support for micro tuning: Scala, Tuning files, MIDI SysEx.
• Pitch-bending, portamento.
• Fully skinable.

http://www.vst4free.com/free_vst.php?plugin=AnaMark&id=2076

FullBucketMusic ModulAir

ModulAir is a modular polyphonic software synthesizer for Microsoft Windows (VST) and Apple macOS (VST/AU) written in native C++ code for high performance and low CPU consumption.

ModulAir is a work in progress, currently in Beta, unfinished, as of now with only a bunch of quirky presets and a lousy documentation. I am not sure if it ever reaches the General Availability stage since I am constantly adding modules and stuff to it:-).


Fully modular architecture.
Up to 18 modules per patch.
39 module types available.
Polyphonic Voice and monophonic Master modules.
TUN/SCL micro-tuning file import.
Up to 64 voices polyphony.
MIDI Learn – all parameters can be controlled by MIDI CC.
Double precision audio processing.
Plug-in supports Windows and macOS (32-bit and 64-bit).

https://www.fullbucket.de/music/vst.html