NetSurf is available for various platforms.
The NetSurf project started out on RISC OS in 2002. Since then, it has gone on to become the platform's premier browser.
GTK (e.g. Linux, BSDs, etc...)
The framebuffer front end lets NetSurf run on any system that can provide a framebuffer surface and user input. It has no operating system or GUI toolkit requirements.
Haiku & BeOS
Currently very basic, the Windows port is really just a demonstration at the moment.