Tcl (the "tool command language", pronounced "tickle" ) is an open source, cross-platform scripting language created by John K. Ousterhout at the University of California at Berkeley in 1988. Originally conceived as a reusable, embeddable language core for tools being developed by Dr. Ousterhout and his colleagues, it has come to be much more. It is widely used in applications including web scripting, test automation, network/system management, EDA and CAD, and in a variety of other fields.