Eclipse is an open source IDE (Integrated Developer Environment). It's considered a framework because you can modify it so much and add your own functionality / customize it for a particular application. www.eclipse.org is the main website for the project. They have lots of articles listed there, too. They should bring you up to speed on what its all about. I'll move this to the IDEs and Other Tools Forum where they talk about Eclipse a lot. Please continue the conversation there.