Io
Io is a small, prototype-based programming language with a minimalist syntax and powerful reflection capabilities. It is primarily used for scripting, embedding in other software, and building dynamic, expressive applications.
Hello, world code example:
"Hello world!" println
Popularity: Less than 1% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.
Repositories on GitHub: 2,552