Oz
Oz is a multiparadigm programming language that supports declarative, functional, and object-oriented programming. It is mainly used for concurrent and distributed programming, as well as for teaching and research in the field of programming languages.
Hello, world code example:
{Show "Hello world!"}
Popularity: Less than 1% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.
Repositories on GitHub: 403