Eclipse Babel allows many different ways of contribution.
You can contribute with Translations and become a Language Champion! You can also help by reporting bugs in the existing translations.
You can contribute to the project via the server and plugins providing the translation services, interface, and build system.
See help Babel for more!
https://babel.eclipse.org/babel/help_babel.php and https://eclipse.dev//babel/development/
You can use the code from these repositories to experiment, test, build, create patches, issue pull requests, etc.