Ask HN: Good usage of GitHub projects feature?

Hello HN!

Do you have any good examples for GitHub repos that use the new projects feature? I was pretty excited for that feature at first, but could not really find a lot of good usages in bigger projects. The only project that I know of that really uses (and not just tries it out) this feature is bootstrap.

https://github.com/twbs/bootstrap/projects/2

Do you have any better examples? Thanks!