Nimbits The Open Source Internet of Things on a Distributed Cloud. Nimbits is a collection of software for recording time series data to the cloud. When your systems send new timestamped decimal, json, or xml data into a Nimbits Data Point using the REST API web services, new values can trigger cascading calculations, alerts, statistics and more.
Emoncms is a powerful open-source web-app for processing, logging and visualising energy, temperature and other environmental data.
RabbitPi Free and open source IoT platform with HTML5 UI and Node.js API
Complet system
OpenEnergyMonitor is a project to develop open-source energy monitoring tools to help us relate to our use of energy, our energy systems and the challenge of sustainable energy.
Phant Phant is a modular node.js based data logging tool for collecting data from the Internet of Things. It is the open source software that powers data.sparkfun.com, and is actively maintained by SparkFun Electronics.