Reindeer is the first and only open source browser for mobile platforms. You will find it in the Installat. folder in the menu grid (click the phone emulator menu button on the left to see the menu grid -I DON'T SEE ANY PHONE EMULATOR MENU ON THE LEFT-). It's a fully functioning mobile browser with enhanced homepages:
You can view the Reindeer source here here.
It's well worth noting that Reindeer is licensed under the liberal BSD license, and contributions that enhance Reindeer are almost always committed into the codebase. So in many ways, the direction Reindeer goes in is entirely community driven. We welcome you to checkout, build and play around with the Reindeer and S60WebKit source.
To learn more, see the S60WebKit project page: as they say, patches welcome!
You may find it convenient to move Reindeer to the top-level menu: in the Installat. menu, select Reindeer, then click Options>Move to folder and select Menu as the destination. Go Back then use Options>Move to place the icon in the middle of the 2nd row, so it will be your default.