I hate to be that guy but he did say every programming language. So I work with three on my current project. I was pretty certain one that wouldn't be on the list, but never suspected that all three wouldn't be there. For the record they're Vue, Nuxt and CFML (Lucee), all open source.
Every programming language on Nix, where Nix specifically means https://github.com/NixOS/nixpkgs
The ambiguity versus "*nix" as shorthand for Linux/Unix is unfortunate, but here we are. :)