RPL/2 (Reverse Polish Lisp/2) is a langage derived from the RPL made by Hewlett-Packard for its HP-28S. It has some extensions (preprocessor, compilated libraries, new functions), a TeX output, and can draw graphics.
Funiter (FUNction ITERation) is developed for educational purposes as a laboratory, generating graphs of several types for iteration of real and complex functions with comfortable switching between related types of graphs.