Heptode has released a pair of free guitar pedal VSTs for Windows, Deep Crunch and Heavy Tone:
HEPTODE offers free download of VST plugins that simulates DEEP CRUNCH and HEAVY TONE pedals. The audio sample rate should be at least 44.1kHz for best quality. The Heptode VST plugins are configured with a single mono input and a single mono output.
It is still difficult to simulate the whole behavior of analog components (analog pedals are still alive!). The virtual pedals are therefore not perfect, and do not intend to replace the real pedals. Quality also depends on external components such as the audio card or the computer itself.
Download the free guitar pedal effect VSTs at the Heptode site.