Jamocha is an open source rule engine. The objective of Jamocha is to provide a high quality rule engine and expert system shell environment. We would provide you an engine, the required development tools and a best practice methodology.
...The model meta-data (meta-model level reasoning, or syntax reasoning)
2. Data level: reason about a model and its data (instance model, i.e., diagram)
FOML is built as a semantic layer on top of PathLP - a compact logic rule language of guarded path expressions, an adaptation of a subset of F-logic.
NodeBrain is a rule engine for construction of state and event monitoring applications. It interacts with other monitoring components to perform simple element state monitoring or complex event correlation based on user specified rules. It is extended through the development of node modules (plug-ins) using NodeBrain's C API, and servants (programs written in any language) that interact with the rule engine via stdin, stdout, and stderr.
CAPE stands for Clips And Perl with Extensions. As its name suggests, CAPE is a combined programming environment which allows programs to be written in Clips, a forward-chaining rule-based system which was originally developed
by NASA, and Perl.
JLisa, \"Java Lisp-based Intelligent Software Agents\", is based on Lisa, http://lisa.sourceforge.net/, a production rule system similar to Jess. It runs in java through ABL, armed-bear Lisp, http://www.armedbear.org.