The Junkers Ju 287 was a German flying testbed built to develop the technology required for a multi-engine jet bomber. It was powered by four Junkers Jumo 004 engines, featured a revolutionary forward-swept wing and was built largely from scavenged components from other aircraft.
The flying prototype and an unfinished second prototype were captured by the Red Army in the closing stages of World War II and the design was further developed in the Soviet Union after the end of the war.
Info: Wikipedia
http://en.wikipedia.org/wiki/Junkers_Ju_287
Profile: Spafi
http://www.spafi.org/resources/category/19