Fury-800

Fury-800, a freeware emulation of the Korg Poly-800.
Its digitally controlled oscillators, noisy paraphonic filter, and the even more noisy pseudo-stereo chorus effect, all add up to create these wonderfully lo-fi, unstable sounds that almost sound as if they were captured from a VHS tape. Add some dusty plate reverb to the Poly-800’s output, and you’re in 80s synthwave heaven.You get all the synth engine features of the original and a few smart add-on options like the “God Mode” for full polyphony and 64 voices of polyphony with full velocity support.
http://music.fullbucket.de/fury800.html

FullBucket FB-1300

FB-1300, a new free synthesizer plugin that emulates the Korg PS-3100 polyphonic analog synthesizer.

“The PS-3100 was, in fact, the first synthesizer with the classic KORG patch bay, previewing many of the well-known MS-20 features, and the first (semi-)modular polyphonic synth at all!”

With this FB-3100 free software synthesizer, they tried to get closer to the original unit, as behavior, controllers, and sound.

This plugin featuring classic two-pole lowpass filters, band-limited oscillators, a resonators section, two modulation generators, sample & hold controls, additional ‘paraphonic’ Envelope. Generator, a semi-modular patch panel, micro tuning option, additional tweaks, MIDI learn and that’s it.

The FB-3100 is a VST™2.4 software instrument for Microsoft Windows® (both 32 and 64 bit) simulating the KORG PS-3100 Polyphonic Synthesizer from 1977. It is written in native C++ code for high performance and low CPU consumption.

https://www.fullbucket.de/music/fb3100.html

Kern synth

Full Bucket Music.

Kern is a VST™2.4 polyphonic software synthesizer plug-in for Microsoft Windows®(both 32 and 64 bit) designed to run with and to be fully controlled by modern MIDI keyboard controllers like the Novation® Impulse™. It is written in native C++ code for high performance and extremely low CPU consumption.

Designed to run with and to be fully controlled by modern MIDI keyboard controllers like the Novation Impulse.

http://www.fullbucket.de/music/kern.html