ANSI cl like python-slicing lisp read macro
Comparing slicing a list/array in Python vs Common Lisp, and showing how you might do Python-like slicing in Common Lisp.
A programmer's editor written in Common Lisp, written for Common Lisp, which aims to be a good Common Lisp IDE; but which also works as an IDE for other languages too.
Think Emacs in Common Lisp.