ioBroker is an integration platform for the Internet of Things, focused on Smart home, Building Automation, Smart Metering, Ambient Assisted Living, Process Automation, Visualization and Data Logging. It aims to be a possible replacement or extension for software like f.e. fhem, OpenHAB or the thing system by the end of 2015. ioBroker is the successor of CCU.IO, a project quite popular in the german HomeMatic community.
ioBroker is not just an application, it's more of a a concept, a database schema, and offers a very easy way for systems to interoperate. ioBroker defines some common rules for a pair of databases used to exchange data and publish events between different systems.