io (Programming Language) is described as 'Io is a prototype-based programming language inspired by Smalltalk (all values are objects, all messages are dynamic), Self (prototype-based), NewtonScript (differential inheritance), Act1 (actors and futures for concurrency), LISP (code is a runtime inspectable/modifiable tree)' and is a programming language in the development category. There are five alternatives to io (Programming Language) for a variety of platforms, including Mac, Windows, Linux, BSD and Haiku apps. The best io (Programming Language) alternative is Python, which is both free and Open Source. Other great apps like io (Programming Language) are Lua, Nim (programming language), Luau and ooc.