And how many of those...
Here's yer Browsing In 2002 Ticklist:
1. HTML 4.0, XHTML 4.0 and XML 1.0 support
2. CSS1 (full compliance)
3. CSS2 (as much as poss)
4. JavaScript
5. Image support - gif, jpeg and png at least.
Amaya doesn't render at all well and isn't suited to general use. It's an experimental platform developed by W3C.
Mnemonic doesn't appear to have been touched for nearly 2 years. It's dead.
Lynx is inferior to w3m in just about every way.
iCab seems to be missing CSS and XHTML support.
"HotJava Browser 3.0 is also a "modern" browser for the Java platform that offers HTML capabilities comparable with Netscape NavigatorTM 3.0." Nuff said.
"Before you download cheetah you must realize that it is not currently in a usable state (yet). I have released cheetah this early so that potential developers can get a feel for how the project is being put together and can start contributing."
I could go on. The point is that these products are NOT viable replacements for Mozilla - in many cases, they're not viable replacements for Netscape 4!
And BTW, Netscape 6.2 is every bit as fast and sleek as Mozilla 0.9.6 whence it sprang. You don't HAVE to install every geegaw and widget that comes with it, ya know.
If I had the free time and money, I'd attempt to write my own browser. :)
Don't bother. Your time would be MUCH better spent contributing to one of the existing projects. A web browser is a much larger undertaking than most people realize - hence the never-gonna-be-anywhere-near-finished status of most of the projects you listed.