Eclipse is the IDE we use for Java. Download the version for your platform. Unzip the files, and follow the directions for your platform.

For Mac users: On OS X, sometimes Stuffit Expander messes up when decompressing the mac file, and no Eclipse application is shown in the folder that results from decompressing. If this happens, download the file linked to your Applications folder. Then open Applications/Utilities/Terminal.app, and type the following commands:

cd /Applications
tar -zxvf eclipse-SDK-3.2.1-macosx-carbon.tar.gz
rm eclipse-SDK-3.2.1-macosx-carbon.tar.gz

Now when you open your Applications folder in the Finder, you should see a folder there called "eclipse" which contains the Eclipse application.

Download Eclipse