Now a days there are lot of web sites which provide facility of sending free SMS. But here you can view these SMS in Chat Window. For this you must have a Gmail account for send free SMS. And if anybody reply to these SMS it shows in chat and all this communication will save in chat history. But you can send only 50 SMS at one time.￼
Go to Gmail Setting and then Tab.
Here you see the list of futures, select SMS(text messaging) in Chat and Enable it.
Now you are ready to send free SMS to your contact.
￼For this go to chat and search the name you want to send SMS.
Now click on that name and select Send SMS from right hand side option.
A window will appear in which you have to provide mobile number of that contact and save.
Now go to chat window and type SMS and press Enter.