Download from battleofthebits.org
The simplest VSTs always end up being the most versatile, to me, because they are not crowded in their own effects. The sound and tone of Medusa is really nice!
The goal of this Battle of the Bits contest was to make a piece using only a single VST, which was the single-oscillator (and unfiltered and un-reverbed) VSTi called Medusa.