Home: a high-performance, free Common Lisp implementation

CMUCL is a free implementation of the Common Lisp programming language which runs on most major Unix platforms. It mainly conforms to the ANSI Common Lisp standard. Here is a summary of its main features:

Latest News

For the most up-to-date info and news, see CMUCL Trac. For older news see News.
CMUCL 20e released
CMUCL 20e has been released, For information on the changes between 20e and 20d, we refer the reader to the 20e release notes. Because of the release, there will not be a 2013-10 snapshot. .

What is Common Lisp?

Common Lisp is well suited to large programming projects and explorative programming. The language has a dynamic semantics which distinguishes it from languages such as C and Ada. It features automatic memory management, an interactive incremental development environment, a module system, a large number of powerful data structures, a large standard library of useful functions, a sophisticated object system supporting multiple inheritance and generic functions, an exception system, user-defined types and a macro system which allows programmers to extend the language.

Pascal is for building pyramids -- imposing, breathtaking structures built by armies pushing heavy blocks into place. Lisp is for building organisms ...
Alan Perlis
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