On this page you find free VST plugins for Windows. Try them :

dSpirit Galaxy
A very little synthesizer with one sine oscillator per voice. As the voices can modulate each other, the really interesting stuff is created by playing polyphonic or setting up long attack and release times.

dSpirit Vocoder
A vocoder with 24 bands. Each band can be controlled in analysis frequency, synthesis frequency, volume, panning and switched on and off. There are macro parameters for formant shifting, pan spreading and output volume, as well as presets handling 16,17...24 bands.

dSpirit GrainyOne
A simple granular sampler capable of loading only one sample (root key fixed to C3). There are controls for speed, grain length, grain density and grain offset randomization. Take this release as a preview, in the future I'll add filters, envelopes ...