The Great Online Shopping Festival is just like Cyber Monday. This is for India only from Google India. This year (2013) the Great Online Shopping Festival starts on 11th December 2013 and last day will be 13th December 2013. Last year it was on 12th December and was there for 5 days. (The Great Online Shopping Festival India on 12th December 2012).
There are so many sellers associated with this like Amazon, eBay, Croma, Intel, Dell and many other.
You can check the list of sellers on the official Great Online Shopping Festival website here. The most attractive thing is that the sellers included from all product ranges, so that you can get almost any product you want to purchase online.