VSTNotesLicense
Cobalt by Leslie SanfordCobalt is a take on a lot of the 80s hybrid synths, like the LA-synthesis D50free
DexedA perfectly workable emulation of the famous Yamaha DX7. Open-source, so you can always build your own.GPL-3.0
Digits by Extent of the JamDigits emulates the other 80s pre-sampling, pre-wavetable architecture -- Phase Distortion, like the Casio CZ series.GPL-3.0
TAL-NoiseMakerOne of my favorite VST instruments at the moment. Comes with a great set of presets and a pretty good yet usable assortment of features. It's got most of the features that you'd want out of a virtual-analog polysynth.free