Many of you(myself included) are SMS junkies. More than half of the mobile bill is because of SMSs. So, why not just send SMS from computer or mobile for free. What you will need is just a computer or a mobile with internet connectivity. Only minus point in such free services is that they will most of the times send small advertisement included in your SMS, but this should not matter as we can get our message across for free.

Send Free SMS from Computer

All you need to send SMS from computer is to have an active internet connection on your computer. Go to http://www.gizmoSMS.com and select the phone number to which you want to send the SMS. There are many other services where you can send free SMS. Some of them are given below:
IndyaRockz.com
YouMint.com
Babuki.com
Text4Free.net
SMS2India.net
SendSMSNow.com
cbfSMS.com
freesms8.com

Send SMS from Mobile:

To send free sms from mobile phone, you should have a mobile with internet connectivity (GPRS). You will need to install a small app on you mobile. This app is also free and is called Cellity. You can download it here. Please keep in mind that you may still need to pay for Data Transfer. But this should not bother if you have an unlimited plan.

If you have any other tools to add here, add them in comments. I would appreciate it.