Which programming languages are the closest to 'finished'?

Two languages come to mind:

1. Elixir's creator Jose Valim has stated that Elixir is pretty much feature-complete. I think they're potentially going to add some static-typing stuff, but the language is "complete" as far as I can tell.

2. This is going to sound weird, but I think Elm is pretty dang close to complete. Elm 0.19.1 came out years ago, and it's stable as heck. I suspect that Evan has one or two more things up his sleeve before "1.0", and then that will be it forever. The Elm community has a very high standard for quality and stability.

I'm surprised that no one mentioned COBOL or ADA.

I would call Ada mature, but not finished. There are still plenty of issues under discussion.

https://github.com/Ada-Rapporteur-Group/User-Community-Input

The Common Lisp standard was completed in 1994.

The spec for Nock, the low level language for Urbit, will only have 4 more versions.

See "Kelvin versioning": https://developers.urbit.org/reference/glossary/kelvin