I've not heard of any of this stuff so I can't really comment. Is Webkit a browser or an IDE ?
It's an open source webbrowser engine, you can use it to build your own browser.
Do we have to start developing a browser from scratch yet again ?
No, we could base it on WebKit ;o)
So far we have had CAB, Draconis, Wensuite, Highwire, Dillo, Links and probably more like Newsie.
Don't forget Spider, the vaporware webbrowser that was added as a menu option to Oasis 2 and only displayed a very cool logo with 'coming soon'. ;o)
The only one of those browsers usable to continue development would be Highwire, but once WebKit is ported it'll be a lot less effort to stay up to date with new browser features.
Maurits.