Great Cannon

Overview
The Great Cannon of China is an attack tool that is used to launch distributed denial-of-service attacks on websites by intercepting massive amounts of web traffic and redirecting them to targeted websites. . . . [T]he Great Cannon hijacks foreign web traffic intended for Chinese websites and re-purposes them to flood targeted web servers with enormous amounts of traffic] in an attempt to [[disrupt their operations.

The first known targets of the Great Cannon (in late March 2015) were websites hosting censorship-evading tools, including GitHub, a web-based code hosting service, and GreatFire, a service monitoring blocked websites in China.