yes there is a lot:
as already mentioned there is:
- krops
- colmena
- nixops (“on life support”)
and a lot more: - deploy-rs
- bento
- morph
- nixus
- lollypops
- nixinate
- just plain nixos-rebuild supports --target-host
- inv
- and maybe nixos-anywhere
and probably a ton more that’s just a few I know