Lispworks has a capable IDE. It looks like a 1995 Geocities page but it works well enough. Their editor is Hemlock which is a Common Lisp clone of emacs, so mos

Lispworks has a capable IDE. It looks like a 1995 Geocities page but it works well enough. Their editor is Hemlock which is a Common Lisp clone of emacs, so most of the key bindings are the same as emacs and you can rebind them if you wish. Or you can use Lispworks without the IDE and drive it with (real) emacs and SLIME. Personally I prefer the CCL IDE but it only works on the Mac.