Voice Dictation for Mac
If you have a Mac with the Lion, Maverick, or Yosemite operating system, this feature is already on your computer. It is similar to Dragon Naturally Speaking – it types what you say. You may need to enable Voice Dictation in your System Preferences. By default, press fn twice, and your computer will be ready for you to dictate. It is not perfect, but it’s pretty good. I use it often. [source: additudemag]