Alarma is a project mainly written in JAVASCRIPT and PYTHON, it's free.
Google Chrome App
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Lecturas para desarrollar en Google Chrome Webstore
Thinking in Web Apps - http://code.google.com/chrome/apps/articles/thinking_in_web_apps.html Hosted Apps - http://code.google.com/chrome/apps/docs/developers_guide.html Getting Started Guide - http://code.google.com/chrome/webstore/docs/get_started_simple.html