Morse Mania for Mac

From Black Cat Systems: Morse Mania is a morse code tutor for the Macintosh. The software packagehelps you learn morse code at speeds ranging from 5 to 30 words per minute. Morse Mania is ideal for amateur (ham) radio operators who desire to learnor improve their morse code proficiency, especially in order to upgrade their license class. In addition to drills to help learn the various characters, Morse Mania also allows complete text files to be sent, so that "real life" messages can be used for practice. Koch mode is available, which is generally considered the quickest way to learn morse code. It also supports the Farnsworth mode, which increases the speed of the dots and dashes, and lengthens the pause between letters sent, allowing the student to learn morse code at higher speeds more easily.

You can also use Morse Mania to transmit morse code on an automated basis, using Applescript.