Contiki is an open source operating system for wireless sensor networks and the Internet of things. Contiki provides low-power networking for resource constrained systems along with a development and simulation environment that makes research, development, and deployment easy. Contiki contains the low-power wireless Rime communication stack , the uIP TCP/IPv4 stack , and the IPv6 Ready certified uIPv6 TCP/IPv6 stack , complete with 802.15.4 6lowpan header compression and fragmentation.
The Instant Contiki development environment is a single-file download with all Contiki development and simulation tools .
Contiki 2.5 is a major update with many important new features. Release candidate 1 is released 3-4 weeks before 2.5 is released and is intended to help find showstopper bugs before the final 2.5 release. The code can be downloaded from the Contiki website.
New features in Contiki 2.5
ContikiRPL is an implementation of the proposed IETF standard RPL protocol for low-power IPv6 routing that now is the default IPv6 routing protocol in Contiki .
The ContikiMAC state-of-the-art low-power listening asynchronous radio duty cycling mechanism is now the default duty cycling mechanism in Contiki.
Contiki collect is a CTP-like address-free data collection protocol that has been completely reworked to provide a significantly improved performance as well as configurability.
CollectView is a Java GUI that is used to set up a Contiki data collection network, either over Contiki collect or over UDP/IPv6/RPL.
Powertrace is an interface to the Contiki power profiling system that allows either real-time inspection or off-line analysis of the power consumption of a sensor network .
The MSPSim/Cooja simulation environment has received a significant speed-up.
Contiki 2.5 includes an experimental implementation of the IETF CoRE group’s CoAP application layer protocol for RESTful interaction with a low-power IP sensor network .
Zolertia Z1, RedWire Econotag mc13224v, ST Microelectronics STM32w, Sentilla JCreate.
The Contiki Team
Adam Dunkels, SICS; Oliver Schmidt, SAP AG; Niclas Finne, SICS; Joakim Eriksson, SICS; Fredrik Österlind, SICS; Nicolas Tsiftes, SICS; Zhitao He, SICS; Simon Barner, TU München; Simon Berg; Julien Abeillé; Mathilde Durvy, Cisco; Colin O’Flynn, NewAE; Eric Gnoske, Atmel; Blake Leverett, Atmel; Michael Vidales, Atmel; David Kopf; Kasun Hewage, University of Colombo; Zach Shelby, Sensinode; Anthony Asterisk; Raimondas Sasnauskas, RWTH Aachen; Salvatore Pitrulli, ST Microelectronics; Dogan Yazar, SICS; Ricklef Wohlers, Oxford.
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 A. Dunkels, F. Österlind, N. Tsiftes, and Z. He. Software-based on-line energy estimation for sensor nodes. In Proceedings of the IEEE Workshop on Embedded Networked Sensor Systems (IEEE Emnets), Cork, Ireland, June 2007.
 A. Dunkels, F. Österlind, and Z. He. An adaptive communication architecture for wireless sensor networks. In Proceedings of the International Conference on Embedded Networked Sensor Systems (ACM SenSys), Sydney, Australia, November 2007.
 M. Durvy, J. Abeillé, P. Wetterwald, C. O’Flynn, B. Leverett, E. Gnoske, M. Vidales, G. Mulligan, N. Tsiftes, N. Finne, and A. Dunkels. Making Sensor Networks IPv6 Ready. In Proceedings of the International Conference on Embedded Networked Sensor Systems (ACM SenSys), pages 421–422, Raleigh, North Carolina, USA, November 2008.
 N. Tsiftes, J. Eriksson, and A. Dunkels. Low-Power Wireless IPv6 Routing with ContikiRPL. In Proceedings of the International Conference on Information Processing in Sensor Networks (ACM/IEEE IPSN), Stockholm, Sweden, April 2010.
 N. Tsiftes, J. Eriksson, N. Finne, F. Österlind, J. Höglund, and A. Dunkels. A Framework for Low-Power IPv6 Routing Simulation, Experimentation, and Evaluation. In Proceedings of the conference on Applications, technologies, a rchitectures, and protocols for computer communications (ACM SIGCOMM), demo sess ion, New Delhi, India, August 2010.
 D. Yazar and A. Dunkels. Efficient Application Integration in IP-Based Sensor Networks. In Proceedings of the ACM BuildSys 2009 workshop, in conjuction with ACM SenSys 2009, November 2009.
Source : http://www.sics.se/contiki/