RTEC is an open-source Event Calculus dialect optimised for data stream reasoning. It is written in Prolog and has been tested under SWI-Prolog and YAP in Linux, MacOS and Windows.

RTEC comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to redistribute it under certain conditions; see the GNU Lesser General Public License v3 for more details.

Latest documentation.

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• iRTEC: Incremental RTEC. iRTEC supports incremental reasoning, handling efficiently the delays and retractions in data streams.
• oPIEC: Online Probabilistic Interval-Based Event Calculus. oPIEC supports Event Calculus reasoning over data streams under uncertainty.
• Wayeb: Wayeb is a Complex Event Processing and Forecasting (CEP/F) engine written in Scala. It is based on symbolic automata and Markov models.