VoiceCommander for Mac

From Creaceed:

Voice Commander is a Mac OS X software that allows commanding applications using the voice. It uses Mac OS X built-in speech recognition technology to produce the appropriate key-presses corresponding to the user installed voice commands.

It works by letting the user define a set of voice commands, that is a combination of key shortcuts and associated spoken words, and then use these commands to control any running application. You can use it with the most popular shortcuts (copy, cut, paste, print...) for any application, or, for instance, you can choose your weapons in Quake-like games, again using the voice !

It works seamlessly with any Mac OS X application, being Cocoa, Carbon or even Classic.