OpenRocket is available as packages for Linux, macOS and Windows. A .jar file is also available, as is all of the source code.
For most users, we strongly recommend using the package appropriate for your operating system. These packages contain all of the needed dependencies, including the correct version of Java.
Obtain from the Repository on GitHub
Finally, you can simply go to the source repository on GitHub. Fork me on GitHub
Thanks to a generous license for open source projects, OpenRocket uses the install4j multi-platform installer builder to produce installers for Windows, macOS and Linux.