Classilla is a free, open source browser for Mac OS 9*
Classilla is bringing back web browser support to your classic Macintosh -- built on WaMCom, a port of Mozilla to classic Macintosh systems, using the same technology underpinning the popular Firefox browser. It's completely free and it's open source, and it's standards-compliant. Use it without cost or restriction; or, if you've got the skills, hack it and make it your own. Classilla brings your wonderful old Power Macintoshes back to life and back online. :santa:

*and where possible Mac OS 8.6

Classilla isn't finished
It's worth repeating: Classilla isn't finished. WaMCom's last update was in 2003, and that means over six years of Mozilla patches and updates to catch up on. While Classilla has a lot of critical patches applied (which is why it's being released, even in unfinished form), there are still security, stability and compatibility issues yet to be fixed and many sites still won't work, or worse. You will be using software that is still in evolution. Exciting, right? Yes. And quite possibly unstable. Know what you're getting into. Using Classilla is at your own risk. There are still many bugs!

Remember: the Classilla maintainers and administrators are not responsible for any damage to your computer, data or operating system that Classilla may do. Again, you use Classilla at your OWN RISK. We eat our own dog food, but that doesn't mean it always tastes good.