Here are some more useful links:

Drools 4 reference guide:
http://downloads.jboss.com/drools/docs/4.0.7.19894.GA/html/index.html

Antlr3 Grammar for drools 4 language:

http://viewvc.jboss.org/cgi-bin/viewvc.cgi/labs/labs/jbossrules/trunk/drools-compiler/src/main/resources/org/drools/lang/DRL.g?view=logpathrev=9631

Another nice to have feature would be graphical editing of Drools Flow (v5.0 and upward) process files.

At least if full syntax highlighting and java click-through were supported then simple rule editing would be much better. Agree that debugger could come later if we could get this sooner. We are trying to figure out whether we allow 2 IDEs or if we should move the department to Eclipse.

Even bundled with some basic syntax rules could really help eg http://blog.athico.com/2010/09/add-jboss-drools-support-in-intellij.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+DroolsRSS+(Drools+-+RSS)&utm_content=Google+Reader

As far as I know, there is a very good Drools plugin available for the Eclipse IDE. I'm not so sure about the architectural differences between Eclipse and IDEA, but I assume that both share similar concepts for extensions (plugins, GUI hooks, ...). Wouldn't it be a favourable approach to factor out the parts of the existing Drools plugins for Eclipse which could be common for both IDEs, and only wrap them in IDE-specific constucts to meet the required extension point APIs of each IDE?

I heard some rumors a while ago that there's even a standardization effort underway to unify extension point APIs between IDEs, maybe this could also help if it is already mature enough and both Eclipse and IDEA support it.

@Michael Neale: who's the best contact person of the Drools project to discuss this with? Who has the most intimate knowledge of the existing Drools tooling inside Eclipse? Let's bring this person and his followers in contact with Sergey Vasiliev@jetbrains

Please do provide this!

For all new voters download my custom file type for drools in between: See http://blog.strug.de/2010/09/add-jboss-drools-support-in-intellij-idea/

Anyone knows when JBoss Rules (Drools) Support will be in IntelliJ IDEA? Any new news about it?

Please, it is really necessary

A graphical rule editor would be awesome!

Isn't it easy for you Jetbrains guys to convert the known grammar of drools with your MPS into a first drools support? Thanks, Leif

This would be a really great feature in IDEA

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Yes please because IDEA is the best IDE tool ever. But the support for DRL files with possible code completion is something I'm waiting for a LONG time. Please add it.

Guys, this issue has lots of votes now, so it is number 5 (http://youtrack.jetbrains.com/issues/IDEA?q=%23Unresolved+order+by%3A+votes) among all unresolved.
Let's push it to the top! Ask your colleagues who works with Drools and Idea to click Vote button here!