What is Lispbox? Lispbox is an IDE for Common Lisp development. Actually, Lispbox is just a pre-configured packaging of the Emacs editing environment, SLIME (The Superior Lisp Interaction Mode for Emacs), the Quicklisp library manager, and the Clozure Common Lisp compiler. Combined, these components integrate to provide all of the functionality you would expect from an IDE, and more. Lispbox makes