Erlang
Erlang is a functional programming language used for creating robust and concurrent software systems. It is particularly suited for building fault-tolerant, scalable, and distributed applications.
Hello, world code example:
io:format("Hello world!~n").
Popularity: 1% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.
Repositories on GitHub: 30,369