There is a small one that comes with the perl/Gtk mail client Pronto! (appropriately called prontobrowser.) They use it for the help system but I believe it can also be used to browse the web in general.
Unfortunately I haven't been able to get any of the HTML widgets it uses (CscHTML, GtkHTML, or GtkXmHTML) to 'make' and install so I can't give any more firsthand information. If it is as well done as Pronto! is, it's worth a look.
sm3g