For OS X, Watson (took me about 10 min. to determine this program actually deserved what it was asking), and Firewalk X, which I paid $12 for back when it was version 1.3.8. To be honest I actually like that version better than the new 2.0 they came out with (although I am happy to see their policy of offering a free upgrade to people who paid earlier, even though 2.0 now costs over $30... excessive imo). Oh, and of course OmniWeb.
Maybe a couple others, only three I can think of atm though. I'll be honest though, some shareware I just laugh at and completely ignore paying for (usually because it's very basic and asking for a laughable amount).
Cheers,
Dak