InfoDock (and its components, OO-Browser and Hyperbole) has had a chequered history. First it was GPLed (and included with XEmacs), then the author decided to restrict distribution of newer versions (he could do that, because he hadn't accepted any patches) and asked the XEmacs team to stop distributing the old version. You could still download the last "open" version, though.

And then AltraSoft became, and started offering both components freely again. Head down to their website and download. And remember, you can buy support for this product!