I started prototyping what could become a module manager using Github to list the modules and to download them.
Currently it will pull the REST from https://api.github.com/search/repositories?q=topic:monkey2+topic:module&sort=stars&order=desc (that is, any repositories marked with the topics monkey2 and modules and sort them by descending stars.)
It will then parse the returned Json, creating the Repositories and Owners instances. Then those could be used to clone / pull into the modules folder, though I haven’t gotten that far.
It can be found here:
https://github.com/seankarol/git-module-manager
I will continue to work on this occasionally though I doubt I will have the time to build it into the full module manager. Please fork, download, contribute, use it, whatever you can!