The gem5 simulator (http://www.gem5.org/Main_Page http://www.gem5.org/Main_Page) sounds like it works in a similar way to let you hook together different compon

The gem5 simulator (http://www.gem5.org/Main_Page http://www.gem5.org/Main_Page) sounds like it works in a similar way to let you hook together different components and simulate different systems. Although gem5 is a research tool and not targeted to specifically emulate real devices.