JetBrains has announced plans to release IntelliJ IDEA 9.0 as open source under the Apache 1.0 license (and you can download the in-development preview version now). The community version won't have quite all the features of the payware Ultimate version--no Ruby, JavaScript, or Perforce support for example--but now that it's open source it may be possible for 3rd parties to fill those gaps, and the open product is still pretty well-featured for basic Java development. Structured search and replace is the most notable omission. It will be nice for IDEA, NetBeans, and Eclipse to finally be able to complete on a relatively level playing field based on features, usability, and speed without excessive concern over price. Personally I've always chosen Eclipse, even when price wasn't an issue; but I know a lot of developers who prefer IDEA.