There are 2 repositories under educational-programming-language topic.
A lightweight recreational and educational language and an assembler for a hypothetical processor, inspired by Forth and Lisp.
Snapp! turns Snap! projects into standalone executables!
Puppy: An Educational Simplification of Python with a Live Playground
pyx scripting language & REPL/Shell ; prs - javascript module for parser combinators
A C# WinForms implementation of the educational programming language Logo with the addition of variables, evaluations and basic control functions (if/then/else/loops etc.)