Developer website: Cory Klingsporn
QThai lets you type Thai with keys that correspond to the sounds of the letters, much in the same way that Apple does with its layouts such as "Tibetan - QWERTY", "Turkish - QWERTY", and others. Apple didn't provide a QWERTY Thai layout, so I made one myself.
Instructions for quick installation and use are included.
Developed and tested on Mac OS X 10.5.4, will work with 10.5 and 10.4. May work on 10.3.