Uraleq is a free advanced multiband processor with flexible parameters and comprehensive Mid/Side processing. More free plugins can be found under the link.
Fractal Filters
Fractal Filters is a FREE Max For Live device (Donations possible).
Puncher 2 Lite
Free Transient Shaper, Multiband Compressor and Parallel Compressor from W.A.Production. Download here.
Jack Dark
Download all abandoned Darkware plugins from Jack Dark here. These 32 Bit plugins might need something like Jbridge to run but are still worth it.
Here are 3 examples:
Microtonic Skins
2 new and free skins are available for old work horse Microtonic from Sonic Charge.
8DIO
You can grab lots of free samples from 8DIO, like hang drum, bongo, cajon, guitar, marimba and more.
Kinto-wari
Kinto-wari is a Max for Live device, which allows to slice an audio file equally depending on BPM and play them back through MIDI notes. Price 35 Dollar.
Cycles & Spots Reaktor Loop Rework is an alternative. In fact, a bargain alternative which also includes 363 samples.
Argotlunar
Argotlunar is a free granular synthesizer from Michael Ourednik.
Free Vaporwave Drum Kit
Aesthetic is a free Vaporwave drum kit, packed with over a hundred kicks, snares, claps, toms and cymbals. As is typical for the genre, all sounds are based on vintage drum machines from brands, including E-MU, LinnDrum, Oberheim or Roland.
Berklee Courses
Berklee College of Music’s Online School offers some music production courses for free.