You'll need to do more than just Google it. Unfortunately someone has just started posting about his project called OpenZWave. THe REAL OpenZWave, which will be fully launched at in the next few weeks and has the backing of a major hardware manufacturer is the one hosted on Google Code. There is a Google group for it too. You can download the code here:
http://code.google.com/p/open-zwave/
Mal
OpenZWave Admin
Edit: The other project have agreed to change their name, so that should mean no confusion in the long run.