Proto-scel-compiler is a project mainly written in Common Lisp, it's free.
A simple compiler for a vaguely SCEL-like language.
This is a simple compiler of a vaguely SCEL-like language to bytecode. Its main goal is to help me understand how SCEL is supposed to work.
The instruction set of the virtual machine resembles the one in Norvig's Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp. For now you'll have to look there for a description of the opcodes.