First time I heard about OpenLogic is at JavaOne. Just recently, OpenLogic announced the availability of their Discovery tool, a tool that scans your network for open source applications installed in computers. I am familiar with a similar application from the BSA for BSA-member software.
So, if you have 500 computers or less in your network, download the tool and try it out. If you have more than 500, then the tool is no longer free. :(