You can use the code from these repositories to experiment, test, build, create patches, issue pull requests, etc.
https://github.com/eclipse/org.eclipse.riena.rap - Project repository hosted on GitHub.
https://github.com/eclipse/org.eclipse.riena.toolbox - Project repository hosted on GitHub.
https://github.com/eclipse/org.eclipse.riena.setup - Project repository hosted on GitHub.
https://github.com/eclipse/org.eclipse.riena.old - Project repository hosted on GitHub.
https://github.com/eclipse/org.eclipse.riena - Project repository hosted on GitHub.
https://github.com/eclipse/org.eclipse.riena.3xtargets - Project repository hosted on GitHub.
https://github.com/eclipse/org.eclipse.riena.plugins.archive - Project repository hosted on GitHub.