For a while a few years back, it seemed like every single new browser was being made in WebKit. While Apple’s Safari browser had been using it for years, Google’s Chrome and the Chromium project seemed to launch it into the spotlight and result in desktop and mobile browsers built on the technology.
While the standard source is optimised for development on OS X and Windows, there is a branch of it specifically for Linux: QtWebKit. With this source you can continue to develop the engine for use on Linux or you can build your own browser using WebKit as a lightweight rendering engine.