A list of Java Integrated Development Environments that I have personally used at one time or another.
JCreator A robust freeware IDE with syntax highlighting and other features. My personal favorite to use.
jGrasp A very nice freeware IDE with many features including syntax highlighting and a UML generator.
NetBeans This is what Forte is based on. I find it to be a little snappier than Forte though. A very nice editor with code completion and syntax highlighting.
Jedit Another free IDE written entirely in Java with source code available. Has some really nice features but most come from plugins and programmable macros. Not a good one for those with little to no programming experience.
Jext Written in Java. A nice text editor but you must still compile from the command line.
RealJ A nice editor with some good features but is a little difficult to set up the first time.
TextPad A nice editor that can compile Java and offers syntax highlighting for many programming languages.
EditPlus A good text editor with syntax highlighting for Java and HTML. Has a browser screen so that you can see what your HTML code will look like.
UltraEdit An editor with syntax highlighting for many languages including Java, HTML, Visual Basic, and C#.