An open source implementation of Common Lisp (probably the language i wrote the most code in) and its accompanying Emacs mode. Had to be added to my collection of programming languages for the mac.

Lisp:

• About SBCL – Steel Bank Common Lisp
  Steel Bank Common Lisp (SBCL) is an open source (free software) compiler and runtime system for ANSI Common Lisp. It provides an interactive environment including an integrated native compiler, a debugger, and many extensions.
  (tags: software lisp commonlisp sbcl)
• SLIME: The Superior Lisp Interaction Mode for Emacs
  SLIME: The Superior Lisp Interaction Mode for Emacs screenshot SLIME is a new Emacs mode for Common Lisp development. Inspired by existing systems such Emacs Lisp and ILISP, we are working to create a fresh new environment for hacking Common Lisp in.
  (tags: software emacs commonlisp emacsmode slime)