I'll mention an earlier comment of mine: https://news.ycombinator.com/item?id=18045890 (a Scheme interpreter running in C++ land, to communicate with via s-expressions (really Scheme code) from 'real' Scheme or Lisp systems. Extending its parser to support Clojure and CL is on my mind, extending the interpreter to run programs written in those languages (e.g. '(defun square (x) (* x x)) instead of '(define (square x) (* x x))) is of course also a possibility if deemed useful enough.)

My work was interrupted because my employer decided to scrap the project this was planned for. I've got permission to release it as open source, which I'll do ASAP (I'm in the middle of cleaning it up a bit). Incidentally my position was made redundant at the same time, so I'm currently looking for new work, most likely I won't have too much time to work on that in the near future, but I'll try to continue working it on the side and will be happy to help where I can. Send me mail to [email protected] if you'd like to be notified once it's up.