BlueJ - BlueJ is an Integrated Development Environment for Java, developed mainly for educational purposes...
Visual Studio Code - Build and debug modern web and cloud applications, by Microsoft
IntelliJ IDEA - Capable and Ergonomic IDE for JVM
Eclipse - Eclipse is an open source community, whose projects are focused on building an open development platform comprised of extensible frameworks, tools and runtimes for building, deploying and managing software across the lifecycle.
Netbeans - NetBeans IDE 7.0. Develop desktop, mobile and web applications with Java, PHP, C/C++ and more. Runs on Windows, Linux, Mac OS X and Solaris. NetBeans IDE is open-source and free.
Greenfoot - Greenfoot is an interactive Java development environment designed primarily for educational purposes at the high school and undergraduate level.