Contiki is an open source operating system for the Internet of Things. The IoT is a collection of technologies that make it possible to connect things like sensors and actuators to the Internet, thereby allowing the physical world to be accessed through the web.
Contiki allows tiny, battery-operated low-power systems communicate with the Internet. Contiki provides powerful low-power Internet communication. Contiki supports fully standard IPv6 and IPv4, along with the recent low-power wireless standards: 6lowpan, RPL, CoAP. With Contiki’s ContikiMAC and sleepy routers, even wireless routers can be battery-operated.
Contiki Community: http://www.contiki-os.org/community.html
Contiki is used in a wide variety of systems such as city sound monitoring, street lights, networked electrical power meters, industrial monitoring, radiation monitoring, construction site monitoring, alarm systems, and remote house monitoring.