Get this and much more plugs free from Analog Obsessions’ Patreon page.
Fury 800 (KORG Poly 800 Emu) has been updated recently to V2.0.1. It’s completly free from Full Bucket Music (Donations possible).
Voltage Modular Nucleus 2 is right now freely available at Plugin Boutique. This collection of 22 modules and 176 presets is the ultimate introduction to modular synthesis.
3 free game console synthesis plugins. Emulations of some of the most iconic chips including the Ricoh A203 (Nintendo), PAPU (Gameboy), MOS Technology SID (Commodore 64, 128 & MAX) and TI SN76489 (Sega, BBC etc).
Cassette Drums is a freeware VST and AU plugin bundle from BRP consisting of three individual plugins: Cassette 606 VST, Cassette 808 VST and Cassette 909 VST.
Have a nice informative read about the Polish Radio Experimental Studio and download sounds from the 1960s-80s in Eastern Europe at Ableton.