Another lisp (lisps sometimes feel like weed: Leave a computing environment unpoliced for some for some time, sure as hell, a lisp has parachuted in and taken root)
What's beyond me, though, why almost everybody who makes their own (un-common, non-scheme) lisp, insists practically on their own vocabulary for defining (e.g.) functions. They avoid the time honored defun, the logical define and even the non- mutilated define-function. Instead they use defn.