Typeit! supports five Malayalam Keyboards. They are Inscript (ISM), GIST, Malayalam Typewriter, Panchari and Varityper Phonetic keyboard Layout. Anyone who is familier with any of the above keyboard layouts can use Typeit! with ease.
I am using for 3 years but now i am sorry to say that after i have used harisree malayalam keyboard i am moved on. I would like to share what i found necessary. Harisree contains a better transliterator than his for fast typing and virtual keyboard with movable buttons for easy arranging of buttons as users wish for a better typing . Just search in sourceforge for harisree and even by looking at the screen shot the difference could be found. Just search for it u will like it i dont have time for this shit.