Freeware - Aelapse Tape Delay Spring Reverb VST Plugin

https://github.com/smiarx/aelapse

ÆLAPSE is a delay and reverb plugin. The delay is based on tape-delay mechanisms, while the reverb is inspired by (but not limited to) spring reverbs. It is designed for a variety of applications, from subtle spring-reverb guitar tones to dreamy synth pads, as well as dub-style snare sounds.

Freeware - QDelay VST Plugin

https://github.com/tiagolr/qdelay

QDelay (short for quick-delay) is a dual-delay with more features than it should for a free plugin that's supposed to be quick. While it offers nothing groundbreaking it is based on popular units like ReplikaXT and EchoBoy. The main goal is to create a free and open plug-in for my own productions, an alternative to the popular Deelay by SixthSample without premium versions or trimmed features or on-line activation.

Freeware - Sonimus DelaySon VST Plugin

https://sonimus.com/products/delayson

Dive into DelaySon, a meticulously crafted plugin that captures the soulful warmth and organic character of vintage tape delay units. Its carefully designed emulation delivers an authentic analog sound, inspired by the timeless charm of classic echo machines. Its intuitive interface and versatile controls make it simple to achieve stunning results, from subtle tape warmth to intricate rhythmic echoes, with unmatched precision and musicality.

Freeware - Pubbas Sheepadoodle Phaser VST Plugin

https://pubbas.com/products/sheepadoodle

The Sheepadoodle Phaser was created to be the most powerful and intuitive free phaser available. Featuring real-time spectral visualization, a responsive GUI, and straightforward controls, Sheepadoodle Phaser invites creativity and exploration. Its unique modulated distortion dynamically tracks the phaser's comb-filter frequencies, letting you effortlessly explore everything from classic vintage tones to exciting new sonic textures.

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 - Igorski VST Plugins

https://www.igorski.nl/download

Interesting set of creative effects. 

Freeware - AudioThing Moon Echo VST Plugin

https://www.audiothing.net/effects/moon-echo/

In our seventh collaboration with Berlin-based musician Hainbach we listen to the stars: Moon Echo is a free to download delay based on a communications technique that uses our closest cosmic neighbor, the moon, as a reflector for radio waves. This results in some rather crunchy and lively echoes, modulated by the movement of Earth and moon. The moon’s surface is an imperfect mirror and creates artifacts, unlike any other echo technique. Moon Echo is both a musical lo-fi effect and a playful tool for teaching about space. Moon Echo is available for MAC, PC, and LINUX (VST, VST3, AU, AAX, CLAP, 64-bit only), and also as AUv3 and Standalone on the App Store.

Freeware - Spectral Audio (legacy) VST Plugins

https://spectral-plugins.com/

3 free plugins: Lofi Cassette, multiband transient shaper, and multifx

Freeware - Mercuriall Ampbox VST Plugin

https://mercuriall.com/cms/details_ampbox

Mercuriall Ampbox is a next-gen VST/AU/AAX + standalone amp modeling plugin for PC/Mac. It's an ever-evolving platform for all* our products, current and future. You will get Ampbox for free when purchasing one of the supported plugins*. The platform has everything you need to create perfect tones with just one plugin. It's simple, elegant and versatile. Powered by Mercuriall Neural Hybrid Engine v2.0 technology. Mercuriall Ampbox free modules included.

Freeware - Cymatics Memory Analog Chorus VST Plugin

https://cymatics.fm/products/memory-plugin

Introducing Memory: A plugin where past and present blend seamlessly. Memory paints subtle imperfections into audio, in a way that conveys a familiar feeling of nostalgia. With its unpredictable kaleidoscope of chorus & vibrato… this plugin sends any audio signal into an endless labyrinth of feeling and emotion. This plugin steers your ideas off of the usual path, with random pitch modulation that completely alters the DNA of any sound. Try it out on Guitars, Piano, Synths, Horns, or any other audio you’re looking to modify in a unique and memorable way.

Freeware - PSP stepDelay VST Plugin

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

PSP stepDelay (former PSP CM Delay) is a creative delay plug-in designed to provide a wide range of sounds from lush analog tape delays to crazy modulated ping-pongs. Realistic tape saturation, head cueing emulation and versatile control makes a usage of this plug-in a hypnotic experience and a long lasting pleasure. PSP stepDelay is available for free for all who have an active account at our user area. To get access to the plug-in simply open (or log-in to) your free account at our user area. Enjoy!

Freeware - Linda Audio InstaVibe VST Plugin

https://lindaaudio.blogspot.com/2023/06/instavibe.html

Linda Audio releases InstaVibe - creative audio effect which can bring several kinds of modulation and distortion to your tracks. InstaVibe does not model any real hardware but it can be used for effects sonically similar to tape cassette (but it's not limited to).

Freeware - Vulture Culture Inktomi Chorus Phaser Reverb VST Plugin

https://vultureculture.live/pages/inktomi

Currently available only in VST3 format.

Inktomi is the ultimate solution for owners of synthesizers which lack built-in effects. Beyond being a mere chorus plug-in, each effect boasts analog-modeled saturation, and encapsulates the warmth and character of legendary Bucket Brigade Delay chips. Inktomi faithfully captures the imperfect modulation behavior inherent in real, vintage analog components, delivering authentic results.

Freeware - ArtV Turbo Paco Reverb VST Plugin

https://www.kvraudio.com/product/turbo-paco-by-artv

Turbo Paco is an old-style Algorithmic Reverb, based on some own and other classic algorithms reverse engineered and posted by the user "Acreil" on this forum thread. This Effect is mostly about Allpass loop and Feedforward-Comb reverbs, with some few exceptions. There are some Choruses as a bonus.

Freeware - Hz Box by Higher Hz VST Plugin

https://higherhz.com/hz-box/

Hz Box is a free algorithmic soundbox emulator plugin that adds character by changing the timbral quality of any sound. The plugin can help define a sound’s place in your mix by giving it the richness and depth it needs.
Hz Box can also bring flat sounds to life with a little brightness and just the right amount of sparkle. Since we’re taking the concept of what a real-world soundbox does to sound, Hz Box can make subtle character changes or create an entirely new tonal profile.

Freeware - All ohmforce Legacy Plugins

https://www.ohmforce.com/plugins

Ohmicide distortion

Quad Frohmage filter bank

Hematohm frequency shifter

Mobilohm phaser

Symptohm synth

Ohmygod thing

Preadtohm distortion

Ohmboyz delay

Freeware - Witch Pig Plugins Assorted Free FX

http://witchpig.co.uk/plugins.html

Several interesting free plugins here. A chorus/flanger, a Rat style distortion, FX step sequencer and chopper.

Freeware - Green Oak Software Tungsten, Cesium, Crystal VST Plugins

https://greenoak.com/effects/

Delay effect with a twist. Tungsten is a sound design tool to add ambience with texture and color. Use it to create heavenly echoes, dense reflections, or mysterious drones.

Cesium brings distinctive character to a chorus effect, producing sounds that range from luscious stereoizing to exotic flanging to bizarre spatial effects. Use it to add motion and depth to your sound.

One of the most popular virtual instruments of all time, Crystal is available as a plugin for computers and as an app for the iPad and iPhone.

Freeware - Kilohearts Essentials Bundle VST Plugins

https://kilohearts.com/products/kilohearts_essentials

 

Kilohearts Essentials is a free collection of extremely useful effects which can be used as regular plugins in your DAW or loaded as Snapins in any Kilohearts Snapin Host.

Freeware - Fazertone Phaser 74 VST Plugin

https://www.fazertone.com/plugin/5

This was the first ever phaser to come in a small pedal format, but don't let its simplicity fool you: it's a gorgeous, shimmering sound that's been present on countless records, most notably associated with Van Halen and David Gilmour. Using the same neural network tech as our other pedals, we've reproduced all the analog warmth of the original circuit so you can get it in plug-in format - and we're releasing it for free! Get the elegant simplicity of this classic pedal - a welcome respite from the complex controls in more modern gear, all you need is to drag and drop it to instantly get that vintage 70s phasing effect. With the speed knob, you can control the rate of the phasing, allowing you to go from a subtle background wooshing effect, to an intense psychedelic swirl.