Sending Free Sms From Pc

As now the smsing throught mobile is costly and we guyz can get rid of it by sending sms from pc websites.
Some Famous websites are :
www.way2sms.com
www.160by2.com
www.smsfi.com
www.fullonsms.com
www.youmint.com
www.spicesms.com
www.mysmsindia.com