Aqua-Soft ForumsI never even head of most of these. But I would imagine a handful to be using an engine by another (most likely IE, however). Netscape is dead.Look at how many browsers there are:*snip*
The big four are Internet Explorer, FireFox, Opera and (just barely) Safari, with the heavy weights being the former two. It wouldn't be bad, if all of the developers would follow the guidelines set up by W3 for web design (don't even get me started with CSS, and specifically Internet Explorer).
Kinda sucks that the Safari development on Windows is significantly behind from the OS X version. The current OS X build has completely won me over.