HOIC – LOIC's successor made by the hacktivist group Anonymous

HOIC (AKA: H.O.I.C., short for High Orbit Ion Cannon) is a free and open-source network stress testing and DoS/DDoS attacking application for Windows, Mac and Linux. It was written in Visual Basic and C#, developed by Anonymous (a hacktivist collective) during the Operation Payback after federal agents shut down Megaupload, and released as LOIC's predecessor.