Sorry if this question is inappropriate for this group, but I didn't see any oters which would be better suited for the question You didn't see the IDE's and other Tools forum?
Someone should move this
thread.
As far as your question, for projects, I use
Eclipse. For simpler things, like if I just need to whip out a class file for some obscure reason, I will use JCreator. JCreator has a freeware version. It is missing a couple of features like code completion, but it is still a good quick editor.
But again, Eclipse for everything else. Joe Pluta has an EXCELLENT book on Eclipse if you have never used it (or any other IDE) before. It is called
Eclipse Step By Step.
Hope that helps.