This application integrates Twilio SMS, XMPP, and Channels to create a group chat application that connects users via SMS, XMPP, and browser-based chat clients. The application uses App Engine's scalable infrastructure and high-level APIs for persistence, file management, and other common web app needs. It receives inbound messages and sends outbound messages using the Twilio API, App Engine's XMPP service, and Channels API. The application also utilizes App Engine's Channel API to push new chat messages to browser-based clients.