Here's three that are flying under the radar:
Eight free small AtomHub libraries (go to page 3):
If you're looking for a deal on a Mellotron library, this one's a hard deal to beat:
www.muze.shop
Also to note when you're using this library: The backend (spanner) is not locked, so you can tweak things without having the GUI disappear. I've adjusted attacks (for "phlegato"), stretched samples to match displayed (blue) key ranges with no issues. Note that, if you want to access the arp/sequencer/etc without locking out the GUI, you should use an Empty tab in the Script Editor display/button (I leave the newly-created arp in the Script Editor display/button "on" when I exit the back end so I can just click on the spanner to have the arp screen immediately display). Also note that, whenever you make tweaks in the back end, you may not get a "Really replace?" message with a subsequent nki Drag'N'Drop onto the GUI.
If you were a fan or user of BigWerks Kontakt libraries, there used to be a number of Soundshaperzkitz libraries available on the BigWerks website. The previously-hosted Soundshaperzkitz libraries are being sold along with their newer libraries in a Kontakt bundle (20 total libraries) for $20 at:
beatbossb.wixsite.com
(The above site is from an official SoundShaperzKitz email)
Also, original BigWerks libraries are still available and some of them are even currently on sale for $9---and the Fluoresce library is free:
When you want Kontakt Library / instruments that sound perfect so that you can create the best tracks out there, check out our top Kontakt libraries. Get inspired!
bigwerks.com
N.B.: If you also go for the free Werkaholic library and you're getting missing sample messages and the GUI is not displaying properly:
(1) Move the [Resources] folder in the [Instruments] folder up one level into the main [WerkAholic Kontakt Library (including Scripts)] folder. This should fix the GUI issue
(2) Do a batch save, selecting the [WerkAholic Kontakt Library (including Scripts)] folder both times (if necessary).
Free Kontakt Library Big changes have been happening at BigWerks and we’re excited to welcome you back to the site! While Drake will be pursuing new projects, BigWerks will continue...
bigwerks.com
Paj
8^)