A homoiconic language based on LISP 1.5/SICP Scheme interpreters. The syntax is JSON.
Why? To understand Lisp better. To experiment with language design. To possibly use as a compilation target. For fun.
Here's a program that computes the sixth Fibonacci number:
["begin",
["define", "fib",
["lambda", ["n"],
["cond", [["eq", "n", 0], 0],
[["eq", "n", 1], 1],
["T", ["+", ["fib", ["-", "n", 1]], ["fib", ["-", "n", 2]]]] ]]],
["fib", 6]]