Freeware - SonoBus High Quality Network Audio Streaming VST Plugin

https://sonobus.net/

SonoBus is an easy to use application for streaming high-quality, low-latency peer-to-peer audio between devices over the internet or a local network.

 
Connects multiple users together to send and receive audio among all in a group, with fine-grained control over latency, quality and overall mix. Includes optional input compression, noise gate, and EQ effects, along with a master reverb. All settings are dynamic, network statistics are clearly visible.

 
Works as a standalone application on macOS, Windows, iOS, and GNU/Linux, and as an audio plugin (AU, VST, and AAX) on macOS and Windows. Use it on your desktop or in your DAW, or on your mobile device.

 
Easy to setup and use, yet still provides all the details that audio nerds want to see. Audio quality can be instantly adjusted from full uncompressed PCM (16, 24, or 32 bit) or with various compressed bitrates (16-256 kbps per channel) using the low-latency Opus codec.

Freeware - Transpanner 3D Audio Panning VST Plugin

https://artistsindsp.gumroad.com/l/transpanner

Drawing inspiration from 'Transaural Panning,' Transpanner brings an adaptation of ambiophonic crosstalk cancellation and phase relationships. This offers a three-dimensional audio environment, going beyond the traditional stereo field. Importantly, Transpanner is designed to be CPU-friendly and operates without introducing any harmful artifacts, ensuring a clean and immersive audio experience.

 
360° Panning: Our implementation of phase panning allows you to design immersive audio experiences within a complete 360-degree landscape.

Rear Filter: Transpanner is equipped with Blauert's bands filtering, which is activated only when panning towards the rear side. This unique feature allows you to enhance the rear characteristics of your audio.

Loudspeakers Distance: Optimize your sound based on your unique loudspeaker setup. Fine-tune the crosstalk cancellation delay for the best spatial audio experience. Note: Transpanner also works effectively with headphone playback.

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 - eoinodowd Layer Engine VSTi Plugin

https://eoinodowd.gumroad.com/l/layerengine

Layer engine is a granular engine standalone vst3 for windows 10/11 and linux distros.

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 - Synful Virtual Orchestra VSTi Plugin

https://www.synful.com/

From its introduction in 2004 until 2023 Synful Orchestra was a copy protected commercial product. It has been used by many concert composers, jazz and rock musicians, film and television composers, electronic musicians, and amateur music creators. Now we want to make it available to everyone without the need for licensing or activation. We hope that it will bring joy and discovery to many.

Freeware - Quilcom SIM-EP Electric Piano VSTi Plugin

https://plugins4free.com/plugin/3298/

SIM-EP has its sound generation model built purely to simulate electric piano sounds like the old and much revered Rhodes and Wurlitzers of this world. It uses no samples, so it’s small, loads quickly and can be adjusted for a wide range of timbres, and can also be pressed into making many sounds well beyond its original remit.

Freeware - Wavefrove Vastaus Tame VST Plugin

https://wavegrove.gumroad.com/l/Vastaus

Vastaus lives on instrument channels, buses and it is known to have been spotted on the master channel too. Feel free to use and abuse it. Try to add an EQ before Vastaus and push the highs way overboard and see how Vastaus reacts.
It is at it's most neutral at Input Gain and Tame at 0, at which time it brings down and blocks overly harsh high frequencies present in vocal esses, smooths cymbals, guitars and pretty much anything you throw at it.
Increasing Tame brings enhances that effect, but also brings in more options with the React switch, as well as with the Bias setting. React is a mode, where Tame starts to let through some transients in a really interesting way, bringing out more detail and clarity, but still smoothing the sound. With Bias, you can further control the sound by limiting the effect to either the positive or negative side of the audio samples, generating harmonics in the process. I have heard this referred to as silky, and apparently some well-known hardware unit makers use a process similar to this.
Lastly there is Gain. With the Input Gain, you control the overall signal boost you get going into the thing, while the Output Gain works as a pad, with 100% level adding no additional volume. Boosting the input gain can bring additional high end to the signal after taming it, which is especially useful with instruments such as the electric guitar. In conjunction with the use of the Bias knob, Vastaus can even act as a leveling tool, which also boosts and extends the high end frequencies far above where they ended in the original signal.

Freeware - Bertom Audio Air Shelf VST Plugin

https://www.bertomaudio.com/air-shelf.html

Air Shelf is a dynamic EQ plugin designed to shape very high frequencies, mostly above 10kHz. Use the Boost knob to get more highs, and the Tame knob to keep high frequency transients under control.