WebKit was originally derived from the Konqueror browser’s KHTML software library by Apple, Inc. for use as the engine of Mac OS X’s Safari web browser, and has now been further developed by Apple, Nokia, Google and others.
KDE 2.0 was the first KDE release (on October 23, 2000) to include KHTML (as the rendering engine of the new Konqueror file and web browser, which replaced the monolithic KDE File Manager).
I remember using KDE2 years ago, thinking how great the KHTML based browser (Konqueror) was, and wondering why their was no one talking more about this browser/engine. Glad to see I wasn't the only one noticing how good the engine is. All the articles covering Webkit/Google Chrome keep taking me back to that time.
List of KHTML and Webkit-based browsers.