L0phtCrack is a password auditing and recovery application (now called L0phtCrack 6) originally produced by Mudge from L0pht Heavy Industries.
On May 19, 1998, all seven members of L0pht (Brian Oblivion, Kingpin, Mudge, Space Rogue, Stefan Von Neumann, John Tan, Weld Pond) famously testified before the Congress of the United States that they could shut down the entire Internet in 30 minutes.