BlueJ is downloadable software for use with Java development. It is different because it is a free service.
BlueJ is an excellent program for both new and seasoned developers. They offer support through books and teaching guides available on their websites. Its sleek design and availability of extensions let the program be easy to use and customizable for both the most simple and complex projects.
This product is free to download, and available across many platforms.
The BlueJ project is supported by Oracle. They benefit from open source licences for JProfiler and JIRA.