Astropy

It took me a while to figure out how to install the development version (which is different from installing the library itself), but it was a quick and easy process after that. I also appreciate that they have a page about the GitHub workflow to make changes to their codebase.

OpenMRS

Unfortunately, I wasn’t able to run their core Java app locally. Even after installing all the prerequisites and trying the build command multiple times, I get compilation errors in the ShoudTaglet.java file.

Open Street Map

I’m not sure which specific project we’d like to work on, but iD, their JavaScript editor for creating and editing features on the map, looks interesting! It was easy to install and build locally, and they also have some open issues for Hacktoberfest.