SMSr is a simple web application for sending SMS messages via the Twilio API. I wrote it as a demo for a potential client project.
Most of the effort went into the front-end — Namely, making the whole thing visually tolerable, and handling SMS submission and status updates without page refreshes. The approach taken here is pretty primitive (it relies on frequent polling for SMS status updates, for example), but it works well enough at a small scale.
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License
BSD