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.
Frequency modulation synthesis (or FM synthesis) is a form of sound synthesis where the frequency of a waveform, called the carrier, is changed by modulating its frequency with a modulator. Most famously, the Yamaha DX7 synth features this type of synthesis. Learn how to sound design with this method and check out free alternative synth plugins.