If so far you have used several websites to send the SMS through PC to Mobile then it is the time go one step further. There is free application way2sms a desktop application which sends messages through Way2sms.com which is already a very popular internet portal to send messages via internet. With this application you can send messages to any Indian mobile number. This utility also supports group messaging where you can send the same text message to a group of people, at a time.
But keep in mind that this application is written in C# then you must have .net framework installed in your computer and you should use your free login account/passowrd information created on the as www.way2sms.com to make it work properly.
Download link given here
From above download extract it and run way2sms exe file and once the application loaded, provide it with the login mobile number and password and start sending sms from right your desktop anywhere in india.