Unfortunately your best options are probably to use Netscape or iCab through a mac emulator. Neither are perfect in todays world either, but provide better rendering than IBrowse/AWeb/Voyager.
I do not agree. IBrowse 2.4 is better and faster than Netscape 4 or iCab on my setup, with a better rendering of webpages and working security certificates. Netscape can't even connect to GMail, even in http mode.