Nix
Nix is a functional, declarative programming language designed for configuration and package management. Its main uses include managing the state of a system, building and deploying applications, and creating reproducible development environments.
Hello, world code example:
"Hello world!"
Popularity: Less than 1% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.
Repositories on GitHub: 27,678