Is there a way to have marketplace packages that are free but allow an open source-like development to occur?

Hey guys, is there a way to create a marketplace package that allows open source-like collaboration? E.g., an example of some kind of 3rd person duck-and-cover project. This project could have edit submissions to the publisher of the package that are integrated (and credited), etc. It’s a more complex feature but since we can’t really post open-source projects it feels like a nice compromise. Thank you!