OpenSensors.io – Connecting Things. HTTP API - OpenTSDB - A Distributed, Scalable Monitoring System. Open Source Solution for the Internet of Things into the Cloud. Open Source for Internet of Things. Internet of Things - ThingSpeak. Open Source Internet of Things. Contiki: The Open Source Operating System for the Internet of Things. Nimbits. Temboo. The Power of Temboo: connect the Yún to 100+ APIs. (Guest post by Temboo Team) Ever wish your Arduino could respond to the weather on the other side of the world? Or send you an email to let you know what it’s up to?