The OwlSim is a VST simulation of the OWL programmable effects pedal.
We've just released a VST/AU plugin binary of the OWLSim in its current state featuring a bunch of different plugin effects that you can switch between.
We see VST generation as a pleasant side-effect of the OWL project that allows people to easily test and debug their code in a familiar environment - the main purpose of the OWLSim framework is developing patches for the hardware, so don't expect a super-neat GUI and bear in mind that the only controllable parameters represent the physical knobs on the OWL pedal.
You can of course change all of this within the framework, so if you want to try making your own binaries, you can download the OWLSim from here:
You'll be able to look at the code from the current set of effects and then edit or build your own patches which will compile as your own VST binaries.