The Ancient Art of Action Roleplaying, free core rules for fast-paced martial arts games using a descriptive action / dice pool system. Price: Pay what you want.
Wushu works its magic via a dice pool mechanic where the size of your pool depends on how elaborately you describe your actions. Each Detail you add to your description earns you a die. These could be separate stunts, witty one-liners, cinematic flourishes, pretty much anything that enhances your gaming experience. (You always get at least 1 die, just for doing something.)