GNU: Right license, high end requeriments, REPL env, Guile/Emacs
BSD: OK-ish license, low end requeriments. fire and forget env, TCL/Tk
Hyperbola GNU/Linux and future Hyperbola/BSD: Best of both worlds.
The right license, small tools, libre kernels, KISS, you are
free to set Emacs and some Lisp on your own.
I use Stklos (and Guile) for Scheme and SBCL for CL.
GVim-Motif+Slimv under EMWM. Hackable tools with a 'dumb' core. As it
should have been since GNU decided to clone ITS on top of Unix.