Short answers: (a) Common Lisp, typically SBCL. (b) Nothing terribly exotic about the selection, but since Lisp libs tend to be Lisp-all-the-way-down (compare

Short answers: (a) Common Lisp, typically SBCL. (b) Nothing terribly exotic about the selection, but since Lisp libs tend to be Lisp-all-the-way-down (compared to wrapper-on-a-C-lib, common in the Python world) you can use them in creative ways the authors never imagined, which would elsewhere require, say, rebuilding C code with custom hooks. (c) Not yet, but my CTO keeps bugging me to start one, so maybe next week when I have more time...