Couture, is a pretty useful new transient designer. The free version just misses the saturation options:
https://www.auburnsounds.com/products/Couture.html
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Phazor, based on Virus phasers:
Betabugs PhaseBug: Continuous phase adjuster.
Only 32bits Windows, and seems quite a rare but useful utility. (Similar to some functionality in Voxengos payware PHA-979). Gives you much more control than the more common and simple phase flip switch.
Great for drum layering and dealing with phase cancellations, particularly with low frequencies in kicks:
Mono version included or you can macro the stereo version controls in a doofer:
www.pcjv.de/vst-plugins/betabugs-plugins/
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A nice little youtube video explaining the issue, but using sample offsets to solve the same problem:
2 Likes
Hofa Tilt Eq
Great plugin for quickly shaping your tracks
-Tilt EQ with curve adjustments via Width control and padlock icon
-High and low pass filters (6/12dB)
-resizable GUI – Recommended to enlarge and Set as Default preset in the settings
Only missing the spectrogram and dynamic EQ from the payware version:
https://hofa-plugins.de/en/plugins/4u-dynamictilteq/
The freeware includes:
- gain/cut up to 24 dB
- variable tilt width for transparent adjustments as well as musical sound shaping
- splittable bass and treble tilt
- low and highcut filter (6 & 12 dB/octave)
- individual routing for stereo, mid, side left and right processing
- up to 32x oversampling
- support for Mac and PC, 32- and 64-bit DAWs
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Necro bump for this thread, so I don’t have to keep going back through my archives and everyone still loves Freeware, even if some of it is 11 years old now; it’s still fun to play with 
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Not tried this but just seen a free linear phase EQ released here:
Download on kvr:
Hrast programmer
diodow
tranzistow
http://www.hrastprogrammer.com/hrastwerk/tranzistow.htm
Tranzistow is DEEEEEEEEEEEEEEEEEP , verry deep
The developer now works for John BOwen (solaris)
bought them all from TDL, worth it!
https://www.fullbucket.de/music/fbphaser.html
Analog modelled phaser, freeware.
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A new free EQ from Fuse Audio:
Also just found they have a very stripped down version of their reverb plug. Could be useful on a send with some extra EQ/ processing:
acon digital:
2 Likes
N.I. Komplete start:
https://www.native-instruments.com/en/products/komplete/bundles/komplete-start/
Listed Contents:
https://www.native-instruments.com/en/products/komplete/bundles/komplete-start/included-products/
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EDIT: as forum spam blocking won’t allow more than 3 replies from one user in in a row:
Ozone Imager 2:
2 Likes
http://www.rebel-audio.com/
LoFi Madneß ovaa daa Top!!
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Native Instruments RAUM, a reverb, is free for a limited time as our holiday gift.
https://www.native-instruments.com/en/specials/your-free-holiday-gifts/
Not the greatest reverb though… have a look
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Not sure, if already mentioned, but the Dragonfly Reverb 2.94 seems to be a damn good crossplatform reverb for free, also macos:
Also Surge 1.66 (nightly so far) is online, now providing FM for all types of OSCs, and a bunch of workflow improvements:
https://surge-synthesizer.github.io/#downloads
3 Likes
Here’s a new free reverb: Valhalla Supermassive 
https://valhalladsp.com/shop/reverb/valhalla-supermassive/
5 Likes
Nobody does algorithmic reverbs better than ValhallaDSP. Valhalla Room is monstrous!
Tokyo Dawn Labs - https://www.tokyodawn.net/tokyo-dawn-labs/ # all except slick eq M & limiter have their free version.
Chris from airwindiws: http://www.airwindows.com/
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One Small Clue’s Poise drum sampler + sample Library, just been made freeware (previously $49):
1 Like