General-purpose editor/IDE with high expansibility in Common Lisp

Structural Lisp IDE/browser/computing environment

Nyxt - the hacker's browser.

Coalton is an efficient, statically typed functional programming language that supercharges Common Lisp.

The APL programming language (a subset thereof) compiling to Common Lisp.

Sylvester the Cat's Common Lisp IDE

A curated list of awesome Common Lisp frameworks, libraries and other shiny stuff.

clasp Common Lisp environment

The main repo for the Medley Interlisp project. Wiki, Issues are here. Other repositories include maiko (the VM implementation) and Interlisp.github.io (web site sources)