OffscreenGecko is a library for rendering HTML etc content to offscreen buffers, sitting atop of the Mozilla Gecko rendering engine. The goal is to simplify embedding of Gecko into environments were its output is needed as pixel data, such as 3D engines.
Gtk+ WebCore is a Linux/Gtk+ port of Apple Computer Inc.'s WebCore KHTML html rendering engine including a web component. A reference browser implementation is included in the project.