See also Forth and PostScript.
- Joy: The language Joy is a purely functional programming language, based on the composition of functions. All such functions take a stack as argument and produce a stack as value.
- Factor: Factor is a natural evolution of Forth, combining Forth's simplicity and minimalism with a dynamically typed runtime supporting a Lisp-style object model and meta-programming. Factor also builds upon ideas from Joy, K, and Slate.