CLISP is a Common Lisp implementation by Bruno Haible of Karlsruhe University and Michael Stoll of Munich University, both in Germany; the most recent release is dated 2010-07-07. It mostly supports the Lisp described in the ANSI Common Lisp standard.

CLISP includes an interpreter, a compiler, a debugger, CLOS, MOP, arbitrary precision floats, a foreign language interface and a socket interface. An X11 interface is available through CLX and Garnet. Command line editing is provided by readline which makes it one of the nicer lisps to use interactively - you can auto-complete function and file names with tab, use up arrow to get previous commands and it does paren-matching.

Cross-platform preemptive multiprocessing is in alpha.


CLISP was used to develop part of the Yahoo! Store e-commerce site - see success stories.

The implementation notes constitute its reference guide.

Local CLISP links