I have obtained a free license to IntelliJ IDEA for GeoNetwork OpenSource
developers. A normal license for individual developers costs 200€.
It's a matter of taste but some people find this IDE a lot nicer to work
with than the ubiquitous Eclipse.
You can download the IDE for Windows, Mac OS X or Linux here:
The license is for an unlimited number of developers; if you're interested
I'll send a copy to you. Send me an email stating how you are working on
GeoNetwork. To respect the license I'm not just posting it here.