Kannel
From MobileHacking.org
Kannel is a large-scale open-source WAP and SMS gateway.
- Runs in Linux/UNIX, OS X
- Large but unresponsive developer and user community
- Documented support for a few old devices, poor support for new AT devices.
- Supports multiple devices and providers
- Designed for very large scale messenging
- HTTP GET/POST to send/receive messages

