I think it would be nice to have a little module on open-source codes. R, but also python and julia as possible languages. The idea is to develop a little module with opensource codes so to contribute. The final goal, but that sounds a bit hard work is to contribute to one of these open source projects.
This idea is similar to what has been proposed by @jcolomb but maybe at a much lower level. I would be happy to contribute to an idea as the one proposed by JC but it sounds for an expert audience. I believe as an introductory course it should be nice to show people how to actively contribute to an existing project.
Please let me know your suggestions.