PicoLisp is an intriguing variant of Lisp. It is appealing to me in part because of its simplicity, and in part because it is so easy to compile the Lisp interpreter (i.e., portability, at least, in POSIX environments). I was, for example, able to get it compiled for a tiny Mips LibreCMC system (see the PicoLisp Build for LibreCMC post).
My experimental PicoLisp codes are available at this Savannah repository:
You can download the repository directly with Git command
git clone https://git.savannah.nongnu.org/git/picolisp-nb.git