Moogo Filter is a free Moog-style filter effect for Windows.
It features an envelope generator, which can be triggered by MIDI notes so the plugin can be inserted behind any synth plugin, to play it thru a Moogish filter. The plugin also features an overdrive.
You can preview Moogo below:
Moogofilter runs as a VST-plugin under Windows and is free to download, The only limitation is a nags creen, which can be removed with a small donation