First graphical web browser.
http://www.blooberry.com/indexdot/history/mosaic.htm
Mosaic ... is THE popular pioneer in the GUI browser market and one of the main ingredients in the initial overwhelming success of the World Wide Web. It is also the basis for many other popular browsers.
http://www.go.dlr.de/misc/mosaic/Mosaic-Docs-2.1/help-about.html
The NCSA Mosaic for X developers are Eric Bina and Marc Andreessen. (Andreesen founded Netscape)
