I started putting together a list here: https://www.sourcesort.com/zombies. Only a few projects on there at the moment though. I found projects which had 10 or more unresponded issues created since the project was last updated.
I used the GitHub API search endpoint to find them and some extra code to filter them - searching for projects last updated more than 3 months ago with more than 5 open issues and more than 2/3 of open issues having had no response from a maintainer.
I was surprised by how few projects turned up actually, so I'll probably rethink this and update the list soon.
"Code Shelter is a collective of volunteer software developers that aims to help with maintaining popular open source projects whose authors need a hand or don't have the time to maintain them any more."
