I use P3DO Pro and I love it. It's very good not only for Poser related content but also for other objects. It displays obj, dxf, 3ds, etc, etc, and the new version even makes conversions to obj. It has a link to Poser via a Python script. You can build your own favorites structure (for example, putting together all that is related with V4). 
The support is also good and the price includes future updates. I highly recommend it.
It does not generate a database of Internet stuff, only of what you have in your harddrive.