From CS Networks:
SMS Anywhere allows you to communicate with other SMS Anywhere users via SMS free of charges, as well as to send SMS messages worldwide with ultimate low prices through CS Networks platform.
With SMS Anywhere, you get full integration with your inbox - messages sent and received through SMS Anywhere are available in conversation list. But when you send message through SMS Anywhere, you pay much less comparing to standard mobile operator charges. Furthermore, sending and receiving messages from / to other users of SMS Anywhere is completely free of charge. Just share a link and ask your friend to install an application.
Another cool functionality is that you can also set your own sender address. It can be any number, or text.
By registering via SMS Anywhere application, you will automatically get an account at robust messaging platform from where you can keep a track of your balance, purchase credits, send messages through Web, or download PC software.