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.
Free SGA font
http://www.3drealms.com/keenhistory/keenhistory3.html
Your name in the SGA
http://www.ultrazone.org/sga/
Ancients' Alphabet, Ath, Atlantean, Aurek-Besh, Cirth, Daedric, D'ni, Dragon Runes, Futurama Alien Alphabet, Gargish, Gnommish, Golic Vulcan, Hylian syllabary (Old), Hylian syllabary (Modern), Hylian alphabet, Klingon, Kryptonian, Marain, Matoran, Romulan, Sarati, Standard Galactic Alphabet, Tsolyáni (Tékumel), Tenctonese, Tengwar, Utopian, Visitor, Zentlardy