I believe you’ll like this announcement — IntelliJ IDEA has just gone open-source! Check out the press release as well as the new jetbrains.org community site for the details. We all will soon get a lot of new friends and colleagues in our IntelliJ IDEA community!
Starting with the upcoming version 9.0, IntelliJ IDEA will be offered in two editions: Community Edition and Ultimate Edition. The Community Edition focuses on Java SE technologies, Groovy and Scala development. It’s free of charge and open-sourced under the Apache 2.0 license. The Ultimate edition with full Java EE technology stack remains our standard commercial offering. See the feature comparison matrix for the differences.
Briefly, in the free Community Edition you’ll get all the Java code support — various refactorings and code inspections, coding assistance; debugging, TestNG and JUnit testing; CVS, Subversion and Git support; Ant and Maven build integration; and Groovy and Scala support (through a separate plugin). To learn more and download the Public Preview of IntelliJ IDEA 9 Community Edition, please visit the IntelliJ IDEA Community Edition site.
The IntelliJ platform, the common foundation for all our IDEs (IDEA, RubyMine, WebIDE or MPS), is being open-sourced under the APL 2.0, too.