BlueJ is downloadable software for use with Java development. It is different because it is a free service.
It is suitable for both the newest and seasoned developer in BlueJ. A lot of their assistance is offered through books that can be accessed on their websites. You can use the program on most simple or complex projects with its elegant design and availability of extensions.
Downloading this product is free, and it can be found on many platforms.
Oracle is a project partner of BlueJ. They benefit from open source licences for JProfiler and JIRA.