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.
There's also a version of Netsurf for 68k, but it requires a gfx card and an '060 to be anything approaching usable (and it lacks javascript).
In addition to that there's also OWB, but it also requires a gfx card, and a heck of a lot more processing power (only really suitable for emulated systems). It's quite immature and raw as well, but it has saved my butt a few times on my amithlon box.
