TradeGenie was one of the early math trade trade finders. It ran brute force depth breath first I believe search algorithm. It was the work horse of math trades for quite a while before briefly being de-throned by Genetitrade and then shortly after that when Chris O. "solved" math trades and created TradeMaximizer.
Last release (thread):
TradeGenie 1.2 Released
TradeGenie: Q&A, How it Works, Strategies, etc.