There are many websites which lets you to send free text messages to your friends or anyone.But the main problem for a person like me with these websites is that you have to register on the website.You can only send free sms after going through the registeration process only.

So here are some websites which allows you to send messages without registeration.
1.seasms.com

send sms,mms not only in India but also in other countries.
2.smsti.in

You can send sms upto 160 characters.
3.bollywoodmotion.com

You can send sms upto 500 characters