A very easy-to-use and simple site that lets you send free text messages around the world, to any country.
They give a huge list of mobile phone network providers, one of which you must choose when sending your sms.
No registration is required although you do have to give your email address in order for the service to work.
Registration required, etc:
Registration required? No
Receive messages? No
Confirmed delivery of messages? No
Message length? 5000
Message Quota? 15 msgs per day