You can use the code from these repositories to experiment, test, build, create patches, issue pull requests, etc.
https://github.com/eclipse/lyo - Project repository hosted on GitHub.
https://github.com/eclipse/lyo.designer - Project repository hosted on GitHub.
https://github.com/eclipse/lyo.adapter-magicdraw - Project repository hosted on GitHub.
https://github.com/eclipse/lyo.adapter-simulink - Project repository hosted on GitHub.
https://github.com/eclipse/lyo.docs - Project repository hosted on GitHub.
https://github.com/eclipse/lyo.oslc-ui - Project repository hosted on GitHub.
https://github.com/eclipse/lyo.testsuite - Project repository hosted on GitHub.