Effects/mixing tools and utilities/etc.

Search results showing free effect VST Plugins, VST3 Plugins, Audio Units Plugins (AU), AAX Plugins and Rack Extension Plugins for Windows and MacOS. The results are sorted by most popular with KVR members (Data from MyKVR 'Favorites' Group). Get the 200 best free VST plugins ever made. From synth VSTs and drum VSTs to VST effects, this huge list has only the best of the best plugins. Is a 32-voice subtractive synth with powerful options. VST plugins can add power and flexibility to your digital audio workstation. They can also be very expensive. Here is a collection of over ninety awesome effects plugins that have one thing in common: they're free. Check the details for each plugin to see if it works on your system. Format: VST, AU, RTAS, 32 bit + 64 bit OS: Windows, Mac. On Samara Cycle Audio, you can find a big collection of free VST instruments and effect plugins. One of them is Om Bass 2, a much-improved successor of the original Om Bass. Windows: Windows XP or higher (32 / 64 bit) OSX: OSX 10.7 or higher (32 / 64 bit). AAX: Pro Tools 10.3.6 or higher; Download: Windows / Mac. Delay Free VST/AU/AAX Plugin. Delay is an audio effect that records an input audio signal to a medium and then plays it back after a period of time or after the time you specify. Some of the free.

I'll start this with the recommendation that you should seek reliable sources when considering free plug ins.
It can save a lot of headaches and help find better quality plugins by sticking with reputable and known brands, and sourcing them from either the companies website or well known sources such as:

EXD-80 is a free 32-bit virtual analog drum and percussion synthesizer plugin for Windows. Retro Delay is a flexible all-round delay effect in VST format. The free Spitfish de-esser VST plugin by Digital Fish Phones is an easy to use de-esser effect, aimed mainly at vocal tracks (mono or stereo). Just like the classic analog hardware de-essers, the Spitfish de-esser dynamically filters out harsh, annoying s-like sounds that would otherwise 'spit' in your face.

Plug in Boutique: https://www.pluginboutique.com/categori ... ?free=true
KVR http://kvraudio.com/plugins/windows/vst ... st-popular
Bedroom Producers Blog https://bedroomproducersblog.com/free-vst-plugins/
VST4Free: http://www.vst4free.com/index.php?m=VSTfx
ETC.
Beware of flaky sites and companies who often attach bloat/malware to downloads of plug ins that aren't worth even the free price tag.
Some of my personal recommendations:

32 Bit Vst Effects Free Download

TDR Nova http://www.tokyodawn.net/tokyo-dawn-labs/

32 Bit Vst Host

I have used this heavily since it was first introduced and am still amazed that such an amazing plug in is free!
Their other free plug ins might be of interest as well. VOS EQ, and the Kotelnikov bus compressor are both quite good too.
Voxengo SPAN http://www.voxengo.com/group/free-vst-plugin-download/
Another heavily used and highly recommended tool, this is a free upgrade replacement to the frequency analyzer included in Mixcraft, with added features and utility.
Blue cat https://www.bluecataudio.com/Download/Products/
Offers some free plug in tools worth checking out. The gain suite is a useful utility.
Hofa 4U meter, fader, side pan tool is something new (to me) I am finding useful https://hofa-plugins.de/en/plugins/4u/
Melda productions free bundle contains some very useful tools that tend to be highly flexible and configurable.
https://www.meldaproduction.com/MFreeFXBundle
Also, the Tal reverb and chorus are popular and frequently recommended freebies, as is the Acon delay.
(All available via the sources at the beginning of this post.)
If guitar amp emulations are of interest, you might be interested in the free CS version of Amplitube:
http://www.ikmultimedia.com/products/amplitubecs/
It includes- a digital chromatic tuner, 9 stomps, 4 amps, 5 cabs, 3 mics, and 2 rack effects.
Some people use the stomps and effects for uses outside of Amplitube as well.