Is there any site or software which allows free calling to India's any mobile no?

VOIP

voice over internet protocol

the internet isn't free its grid connected you pay for the internet connection

but "extra services" is how the cell phone telephone kiOSks down the center isles in the mall make the $3000 a month to keep their card tables ... they tack a bill to an internet packet

look up "magic jack" or "unlocking"