TTMessenger 4.0 (Windows)

With TTMessenger you can send up to 30 SMS every day to any part of the world at no cost. You get 10 SMS every day immediately and by getting other users to use the service, you can get up to 20 additional SMS. The SMS originate in Australia and have a very high delivery rate. You can also receive replies. TTMessenger does much more than just SMS, (like Fax, VoIP, IM and VSMS) but to use most of these services you will need to pay (IM and VoIP calls to other TTMessenger users are free).