The Standard Galactic Alphabet or SGA is used in the Commander Keen series of computer games. It was created by Tom Hall, who originally just wanted to make the writing on signs in the games look futuristic or alien. Then he realised that he could create a whole alternative alphabet and add cryptic messages throughout the games.
If you need to type in many different languages, the Q International Keyboard can help. It enables you to type almost any language that uses the Latin, Cyrillic or Greek alphabets, and is free.