Explanation of GNU epsilon https://www.gnu.org/software/epsilon/epsilon.html
"The ε core language, an imperative first-order language, is called ε₀. It’s inconvenient for humans to use for serious problems, yet simple and potentially very efficient. Using ε₀ I’ve built ε₁, a higher-level language with a Lispy feel, but untyped — not dynamically typed like Lisp: untyped, like Forth and machine language."

See also https://ageinghacker.net/blog/posts/33/ for make-gallery, a bash script to generate a HTML photo gallery.