Blue Box, Designed and Built by Steve Wozniak and Marketed by Steve Jobs, circa 1972

Blue boxes allowed people to make free, illegal, long-distance phone calls. They mimicked the same 2600hz "switching" tone used by telephone operators to connect people, tricking automated systems. In the 1960s, notorious "phone phreakers" infiltrated the telephone network; their actions were comparable to modern-day hackers. Built by Steve Wozniak, this box predates Apple Computer Inc. by four years.