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Cobalt by Leslie Sanford(via)
Cobalt is a take on a lot of the 80s hybrid synths, like the LA-synthesis D50
dexed(via)
A perfectly workable emulation of the famous Yamaha DX7. Open-source, so you can always build your own.
Digits by Extent of the Jam(via)
Digits emulates the other 80s pre-sampling, pre-wavetable architecture -- Phase Distortion, like the Casio CZ series.
TAL-NoiseMaker(via)
One 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.