1. BDD-Based Deductive Database. http://bddbddb.sourceforge.net/. BDD-Based Deductive Database. http://bddbddb.sourceforge.net/.
2. Datomic. https://www.datomic.com/. Datomic. https://www.datomic.com/.
3. IRIS (Integrated Rule Inference System) Reasoner. http://repo.roscidus.com/java/ iris. IRIS (Integrated Rule Inference System) Reasoner. http://repo.roscidus.com/java/ iris.
4. LogicBlox. http://www.logicblox.com/. LogicBlox. http://www.logicblox.com/.
5. Righting Code. http://rightingcode.org/. Righting Code. http://rightingcode.org/.