My uni, NC State, has a course (CSC 326) called Software Engineering that has students contribute to an existing project created by the staff in teams, with the best contributions being merged into master for the next semester students to work on.
Same here in Munich, we've had a course on software-testing in OOP-languages and had to write unit-tests for some modules of jenkins which were graded and eventually merged into master.
Sorry - should've been more clear. It's a project written by the staff in Java and Angular. It's been used continuously through the years, evolving each semester with the best contributions being merged. I believe it's a health management service, I haven't taken the course yet.
