The XCF, an undergraduate research group located in Soda Hall, has been responsible for a number of notable software projects, including GTK+ (created by Peter Mattis, BS 1997), The GIMP (Spencer Kimball, BS 1996), and the initial diagnosis of the Morris worm. In 1992, Pei-Yuan Wei, an undergraduate at the XCF, created ViolaWWW, one of the first graphical web browsers. ViolaWWW was the first browser to have embedded scriptable objects, stylesheets, and tables. In the spirit of Open Source, he donated the code to Sun Microsystems, inspiring Java applets( Kim Polese (BS 1984) was the original product manager for Java at Sun Microsystems.) ViolaWWW also inspired researchers at the National Center for Supercomputing Applications to create the Mosaic web browser, a pioneering web browser that became Microsoft Internet Explorer.