Morse Machine is a freeware tutor that helps you learn Morse code by helping you hear how the each symbol in the code sounds. It does this by playing a letter or number and waits for you to type that letter back. As the tutorial progresses, it transmits other letters to increase your Morse vocabulary. There’s another version of the tutor here that doesn’t require installation. This is a simple and a really fun way to finally understanding Morse code.