Aside from defined.net, what are the best frontend/management tools for nebula? Last I looked it was all manual config (which is fine for most of us, but limits adoption elsewhere)
I'm not a aware of any other full-fledged solution. There is some opinionated tooling written in Python [0] and Go but nothing coming close to defined.net. This is definitely a point where other overlay solutions look way better.
After having searched (and implemented) this myself for work, the only practical solutions I found were 1) smallstep [1] or 2) Terraform (with the nebula provider [2]) and a CM tool of your choice. The latter can be nicely combined with the ansible provider if that's your CM of choice.