Yes you heard me right, a Raspberry Pi was used by the author to control 5 servos using a controller board from Adafruit. In this case the author was controlling lego servos. The controller isn’t too bad of a price either, $15 at adafruit (so maybe $10 on ebay?).
http://www.smokedbits.com/2013/05/dancing-lego-and-five-servos.html