Dear users, DroolsTab Protege plugin new version 5.0 published on http://oogis.ru/droolstab It is a spatial scenario simulation visual environment. DroolsTab is designed as a tab plug-in to the open source ontology editor Protege (http://protege.stanford.edu). It uses the open source geo-information system Java library OpenMap (http://openmap.bbn.com) and the open source Java RETE rule engine Drools (http://labs.jboss.com/drools/). It can be used for visual authoring of the complex spatial process simulation scenarios and general rule base authoring. Groovy (http://groovy.codehaus.org) and Clojure (http://clojure.org) languages can be used for authoring auxiliary pieces of code and scripts. Distribution includes several demo examples of spatial simulation in the sea, air and ground environments, including network, web and GoogleEarth applications. In one example used kmlframework of Edvin Boehn (http://code.google.com/p/kmlframework/). DroolsTab and its source code are freely available under the open source Mozilla Public License. Sincerely, Ru