Update, November 2026: this plugin has been superseded. OfficeFloor development in IntelliJ is now supported by OfficeFloor IoCC, which draws function-injection configuration as a flow diagram: https://plugins.jetbrains.com/plugin/35087-officefloor-iocc. Its source is in https://github.com/officefloor/OfficeFloorSlim under intellij/.
While the plugin was originally developed for Eclipse, we have now isolated the functionality into IDE agnostic bundle. This means with a bridging implementation, it is possible to port the OfficeFloor plugin to other IDEs.
However, for now we are content with Eclipse and IntelliJ for OfficeFloor development.
Though if you would like to see OfficeFloor development supported by other IDEs, please get involved!