Freeware - Variety of Sound TesslaPro Mk IV VST Plugin

 https://varietyofsound.wordpress.com/2024/03/01/tesslapro-mkiv-released/

Very nice saturation plugin.

Freeware - PSP Audioware PSP Chamber Reverb VST Plugin

 https://www.pspaudioware.com/products/psp-chamber

PSP Chamber is a freeware reverb plug-in that adds depth and dimension to your audio. Like classic hardware reverbs, it’s designed to emulate the acoustics of physical spaces of various sizes and shapes. The Chamber algorithm is carefully crafted to produce rapidly developing, dense reverberations with a smooth and natural decay. It’s a simple-to-use, great-sounding effect that’s a great go-to option for many tracking and mixing applications.

Freeware - Analog Obsession Poortec VST Plugin

 https://www.patreon.com/posts/poortec-119632465

Pultec style EQ Free

Freeware - Algoriffix Pitch Perfekt VST Plugin

https://www.algoriffix.com/

Unleash your inner rock star with Pitch Perfekt and Transkr V2 — our unmatched audio-to-MIDI plug-ins. Seamlessly integrated into your favourite DAW they will transform your voice or instrument into a MIDI controller in no time.

Freeware - Newfangled Audio Obliterate Filter VST Plugin

https://www.newfangledaudio.com/obliterate

Obliterate started life as a filter, but there was a bug in the code. We could have fixed that bug, but we let it fester. Over time that bug grew and mutated. It gained new powers and its anger warped them to its evil will. Seven years after that initial bug Obliterate can't be described as a filter at all. Obliterate is more like a new form of resonant distortion. Use cautiously. Use sparingly. And always clean up afterward.

Freeware - Chaos Audio Freebie Plugin Bundle

https://chaosaudio.com/collections/tone-shop/products/freebie-plugin-bundle

Guitar stompbox FX

Get seven plugins, including reverb, drive, delay, and EQ, for FREE. 

Apollo - Classic Tube Drive 

Starlight - Shimmer Reverb

Cassini - Harmonic Reverb 

Transit - Digital Delay 

Booster - Clean Boost 

Spectrometer - 6-Band Guitar EQ 

Spectrobass - 7-Band Bass EQ

Freeware - BPB Bassaturator VST Plugin

https://bedroomproducersblog.com/2024/11/26/bassaturator/

BPB Bassaturator is a free VST plugin for bass processing. It uses a push-pull style equalizer and three different saturation types to turn boring bass sounds into fat basslines that cut through a mix.

Freeware - Platone Studio Alton Limiter VST Plugin

https://platonestudio.com/product/alton-limiter/

The Alton Limiter by Platone Studio is a powerful tool for achieving professional-level audio limiting, making it perfect for both mastering and mixing tasks. Whether you want to control peaks or maximize volume without distortion, Alton Limiter offers a sleek, user-friendly interface with advanced features.

Freeware - Wave Alchemy Magic7 Reverb VST Plugin

https://www.wavealchemy.co.uk/product/magic7/

Experience the immersive sound of the legendary Bricasti M7 reverb for FREE with Magic7. Instantly bring three-dimensional depth to your music, effortlessly move between focused, tight drum spaces, airy vocal ambience, authentic rooms, expansive halls and warm chambers. Magic7 is available now as a FREE AU, VST3 and AAX plugin for macOS and Windows.

FREEWARE - FREAKSHOW INDUSTRIES

https://freakshowindustries.com/

All of these plugins are awesome. And the website is awesome, too.

Freeware - Little Audio Little EQ VST Plugin

https://little-audio.com/

Little EQ is an equalizer plugin that brings to life the sound of a passive filter and an output transformer.

Freeware - Chris Liepe Vocal Menace

https://www.mymusicalvoice.com/p/vocal-menace-by-chris-liepe

ALL-IN-ONE Vocal Processing 

 -Multi-stage compression and limiting (no clipping) 

 -Several flavors of progressive drives and distortions 

 -Air and EQ 

 -A unique approach to Reverb 

 -Tempo sync'd and variable Delay 

 -Easy internal effects side chain

Freeware - Audio Assault BassTR Bass Amp VST Plugin

https://audioassault.mx/product/BassTR

Unique Bass Amp with unique distortion! It's part of Bass Locker for free!

Freeware - Sinus Labs Bandbreite Tape VST Plugin

https://www.sinuslabs.io/products/bandbreite

Add warm, analog character to your drums, basses, and 808s. From subtle warmth to slamming saturation, this free plugin delivers. 

 Features: Analog Character,  Tape Slam,  Flutter Effect,  Tube Saturation,  HOT Signal Mode,  *NEW Oversampling

Freeware - Quilcom VST Plugins

https://flowstoners.com/quilcom

Way too much stuff to list. Instruments and effects. Quality may vary.

Freeware - ToneLib TL TubeWarmth VST Plugin

https://tonelib.net/tl-tubewarmth.html

At the heart of this effect is the desire to achieve a tube sound, with all its inherent roughness and vividness, from a dry digital signal. TL TubeWarmth adds even-numbered harmonies to the input signal, which contributes to expanding the tone of the instrument, giving it new colors and depth. The gentle tube overdrive further reveals new edges to the sound, emphasizing the new texture of the tone.

Freeware - Cymatics Origin VST Plugin

https://cymatics.fm/collections/plugins/products/origin-vintage-plugin

Origin is a vintage/lofi plugin created to make your samples sound like they’re straight from an old tape machine. The main knob is a resampler/bitcrusher with two special filters to make your samples sound “underwater” (this effect can often be heard in Drake songs) The other four knobs are Tape Saturation, Noise, Movement, and Chorus. Using these 5 powerful controls you can instantly give your samples a vintage vibe.

Freeware - Igorski VST Plugins

https://www.igorski.nl/download

Interesting set of creative effects. 

Freeware - PA FREE bx_megasingle VST Plugin

https://www.plugin-alliance.com/en/products/bx_megasingle.html

Faithful reproduction of a Mesa Boogie Single Rectifier guitar amp. Now Free.

Freeware - JP01 Fuzzed VST Plugin

https://github.com/JP01/Fuzzed

Fuzzed is an analogue modelling distortion plugin, using "state of the art" state-space modelling techniques to model the physical circuitry of the famous Jimi Hendrix guitar pedal and implement it as a VST plugin using the JUCE API. Rather than simply modelling the general behaviour of the pedal, this plugin uses the circuit schematic to construct a highly accurate simulation of the pedal's behaviour, with full parametric control. This is then implemented as a VST plugin for use in real time. Included are some analysis screenshots of the comparisons between the output of the system and the real pedal, which shows the behaviour of the VST to be highly comparable to the real thing. Use of Fuzzed as a return effect can add beautiful analogue distortion to your sounds without losing the original tonal content. This work is the result of continued development of a plugin created and submitted as part of an individual university project.