Anything that has a motor. What do you need? Take a look here: http://www.vintageprojects.com/
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If its one of the newer Fischer&Paykel smartdrive multi pole motors you can make a windmill to charge 12V batteries.
whats cool about the transmission is that it spins one way it agitates, when it spins the other way it just spins.
Find out how big the motor is - Hp - be sure you can get it going outside the washing machine.
Pretty much anything you need that uses a motor.