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.
My Devices - Drag and drop IoT project builder for Raspberry Pi
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.
ioBroker - flexible and modular application for the IoT and Smarthome
IntelliJ IDEA - Capable and Ergonomic IDE for JVM
Nim Home Assistant (NimHA) - Nim Home Assistant is an open-source home automation platform running on Nim.