Tata Elxsi - Bombay
Nipuna - Chennai
Rhythm and Hues - Bombay
Prasad Efx - Chennai, Bombay and Hyderabad
Primefocus - Bombay and Chennai
Frameflow - Chennai
Dataquest - Hyderabad
Pixion - Bombay
Indian artists - Chennai
Ocher Studios - Chennai
Landmarvel - Chennai
Gemini Studios - Chennai
Digital Magic - Chennai
Prana - Bombay....
etc and lot many are there like this.
