I don't have any further insight, but looking at <https://github.com/hashicorp/nomad/forks?include=active&page...> coughed up https://github.com/atlassian/nomad/branches although confusingly it says "updated last week" but browsing any one of the branches seems to be stupid old so I got nothing

Finding conceptual forks, e.g. $(git push --mirror ...) would be trickier but I bet sourcegraph could do it

Ultimately, the question boils down to: what risk are you driving down: hitching your wagon to a dead stack, not getting security updates, not getting PRs merged, $other?