NeXT

NeXT Inc. was an American computer and software company. It was created after Steve Jobs quit his job at Apple Inc.. It was a failure but it did get him back at Apple and as CEO. The Mac OS x's core was based entirely on the NeXT computer. Apple bought NeXT for $429 million. 
Steve Jobs used $12 million of his own money to make NeXT and it did pay off because he got his job back.