OmniWeb is an excellent web browser made by OmniGroup, those hard core OpenStep loving fools who are now developing for Mac OSX. It was pretty much the only usable browser on NeXT. When OSX Server came along, they ported it to that. It wasn't too great at first, kinda slow. Then came version 3, which was quite speedy. Now they are at Beta4 for OSX. It's very fast, and has some excellent features for cookie and javascript security. All in all, it's one of the better browsers out there on any platform in my opinion. Plus, the guys at OmniGroup run and are very active on some OSX development mailing lists giving a lot of support to the developer community.

OmniWeb itself is free for a single user per site, after that it requires the purchase of a license. Okay, open source would be nice, but I'll take what I can get.