Frege is a purely functional programming language inspired by Haskell. It is primarily used for writing highly expressive and type-safe programs in functional programming paradigms.

Hello, world code example:

module HelloWorld where
main _ = println "Hello world!"

Popularity: Less than 1% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.

Repositories on GitHub: 222