Considering how close Julia is to Lisp, it could be interesting to have an actual Lisp targeting the Julia compiler, for people who don't want to compromise on s-expr but would still want to have a performance oriented Lisp with access to a lot of scientific computation and ML libraries (and probably better interop compared to Clojure and Java for example). The only work I know for this is:
Jeff (creator of Julia) created femtolisp [0] which is used in the Julia parser.