You can use the code from these repositories to experiment, test, build, create patches, issue pull requests, etc.
https://github.com/adoptium/TKG - Project repository hosted on GitHub.
https://github.com/adoptium/aqa-systemtest - Project repository hosted on GitHub.
https://github.com/adoptium/aqa-test-tools - Project repository hosted on GitHub.
https://github.com/adoptium/STF - Project repository hosted on GitHub.
https://github.com/adoptium/bumblebench - Project repository hosted on GitHub.
https://github.com/adoptium/run-aqa - Project repository hosted on GitHub.
https://github.com/adoptium/aqa-tests - Project repository hosted on GitHub.
https://github.com/adoptium/openj9-systemtest - Project repository hosted on GitHub.