Really interesting to see LLVM is going to explore hosting a repo on GitHub! https://lists.llvm.org/pipermail/llvm-dev/2016-February/095809.html (should make contributing even easier!)
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Learning software development through playing and contributing to a MUD:
tree-sitter has been amazingly successful at getting developer tools to work together.
Neovim has a bunch of people contributing to parsers when they notice highlighting issues. That benefits the whole ecosystem: semgrep, difftastic, even Emacs!
Neat GitHub feature I haven't seen before: if the contributing guide has changed since your last pull request, it tells you!

