Editors

Emacs

Emacs is a general-purpose editor and the most widely-used environment for Common Lisp development.

SLIME

SLIME is the most widely-used Common Lisp IDE.

Portacle is a portable and multiplatform development environment. It includes Emacs with Slime, SBCL, Quicklisp and Git.

Sly

Sly is a fork of SLIME.

Paredit

Sublime Text