Krakli has released a free version of S3K, a synth VST instrument for Windows PC.
An S3 ‘mono’ synth with a whole load of attitude. Complete with 64 excellent patches from himalaya, S3K attempts to fuse retro sounds with a hard modern edge. Octaver, Ring mod and arpeggiators are added in addition to the normal Echo, Phase and Reverb effects. For the best effect make sure that you use the modulation wheel to its full potential.
Check the Krakli freeware page for a link to download S3K.