- Drools written in Java, compatible with JSR94.
- JLisa Compatible with JSR94. A Clips-like Rule engine accessible from Java with the full power of Common Lisp
- 一大堆Java based rule engine
- Pychinko: Rete-based RDF friendly rule engine
- RuleCore, for Python
- Ruleby, for Ruby
怎麼現在的Rule engine幾乎都是Java寫的…@[email protected]