In 1995, Farmer and Wietse Venema (a Dutch programmer and physicist) developed a second vulnerability scanner called the Security Administrator Tool for Analyzing Networks (SATAN).
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Among notable software designed and/or supervised by Spafford include the freeware Tripwire tool coded by his student Gene Kim (Spafford was later the chief external technical advisor to the Tripwire company during their first few years), and the freeware COPS tool coded by his student Dan Farmer.
The Coroner's Toolkit (or TCT) is a suite of computer security programs by Dan Farmer and Wietse Venema.
He also wrote TCP Wrapper and collaborated with Dan Farmer to produce the computer security tools SATAN and The Coroner's Toolkit.