EnvayaSMS is a SMS and MMS gateway running entirely as an Android
app. It forwards incoming SMS and MMS messages to a web server on
the Internet, and sends outgoing messages from the web server to
other phones. People with any type of mobile phone can send SMS and
MMS to a phone running EnvayaSMS, without needing their own Android
phone. It works wherever the phone can receive SMS messages and
access the Internet (via Wi-Fi or mobile data connection). Appears
to be capable of sending up to 1000 messages per hour, depending on
the length of the message, the handset used and the network
limitations. It offers a REST API and is available under an MIT
license. No longer under development. Now switched to offering
hosted version called https://telerivet.com/product/messaging
EnvayaSMS is a SMS and MMS gateway running entirely as an Android
app. It forwards incoming SMS and MMS messages to a web server on
the Internet, and sends outgoing messages from the web server to
other phones. People with any type of mobile phone can send SMS and
MMS to a phone running EnvayaSMS, without needing their own Android
phone. It works wherever the phone can receive SMS messages and
access the Internet (via Wi-Fi or mobile data connection). Appears
to be capable of sending up to 1000 messages per hour, depending on
the length of the message, the handset used and the network
limitations. It offers a REST API and is available under an MIT
license. No longer under development. Now switched to offering
hosted version called http://telerivet.com/page/pricing