%T A Tool for Proving Deadlock Freedom %A Jeremy M. R. Martin, S. A. Jassim %E Andr\[`e] W. P. Bakkers %B Proceedings of WoTUG\-20: Parallel Programming and Java %X We describe a tool, programmed in Java, for the formal verification of the absence of deadlock and livelock in networks of CSP processes. The innovative techniques used scale well to very large networks, unlike the exhaustive state checking method employed by existing tools.