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{{Short description|Version of programming language Common Lisp}}
{{Infobox software
| name = CLISP
| logo = LogoCLISP.jpg
| author = Bruno Haible, Michael Stoll
| developer = Various
| released = {{start date and age|1987|4}}
| latest release version = 2.49
| latest release date = {{start date and age|2010|7|7}}
| operating system = [[Cross-platform]]
| language = [[Common Lisp]]
| genre = [[Compiler]], [[run-time system|runtime]]
| license = [[GNU General Public License]]
| website = {{URL|https://www.gnu.org/software/clisp/}}
}}{{More citations needed|date=September 2020}}
'''CLISP''' is an implementation of the [[programming language]] [[Common Lisp]] originally developed by Bruno Haible and Michael Stoll for the [[Atari ST]]. Today it supports the [[Unix]] and [[Microsoft Windows]] [[operating system]]s.

CLISP includes an [[interpreter (computing)|interpreter]], a [[bytecode]] [[compiler]], [[debugger]], [[Internet socket|socket]] interface, high-level foreign language interface, strong [[Internationalization and localization|internationalization]] support, and two [[object-oriented programming|object]] systems: [[Common Lisp Object System]] (CLOS) and [[metaobject]] protocol (MOP).

It is written in [[C (programming language)|C]] and [[Common Lisp]]. It is now part of the [[GNU Project]] and is [[free software]], available under the terms of the [[GNU General Public License]] (GPL).

==History==
Haible did not originally intend to distribute CLISP under the GPL, but in a well-publicised email exchange with [[Richard Stallman]], he eventually agreed to do so. The issue at stake was whether CLISP was a [[derivative work]] of the [[GNU readline]] [[library (computing)|library]].<ref>[https://sourceforge.net/p/clisp/clisp/ci/default/tree/doc/Why-CLISP-is-under-GPL Bruno Haible's email exchange with Richard Stallman]</ref>

==Ports==
CLISP is extremely portable, running on almost all [[Unix]]-based [[operating system]]s as well as on [[Microsoft Windows]]. Although interpreting bytecode is usually slower than running compiled native binaries, this is not always a major issue (especially in applications like Web development where I/O is the bottleneck). CLISP is also easier to set up than other popular [[Free and open-source software|FOSS]] Common Lisps such as [[SBCL]].

==Adoption==
[[Paul Graham (computer programmer)|Paul Graham]] used CLISP to run the software for his [[Viaweb]] startup. Viaweb was an early [[web application]]; portions of it still exist as [[Yahoo!]] Stores, the base for Yahoo Shopping {{Citation needed|reason=As of December 2020, it's unlikely that any of the original LISP-based code still is used for Yahoo! Stores|date=December 2020}}.

Conrad Barski's [[Land of Lisp]] uses some CLISP-specific functions in the textbook exercises.

==See also==
{{Portal|Free and open-source software}}
*[[GNU Common Lisp]]—another GNU Project Common Lisp implementation

==References==
{{Reflist}}

==External links==
* {{official website}}
* [http://www.cliki.net/clisp Clisp article on CLIKI]

{{GNU}}
{{Common Lisp}}

[[Category:Common Lisp (programming language) software]]
[[Category:Common Lisp implementations]]
[[Category:Free and open source interpreters]]
[[Category:GNU Project Lisp programming language implementations]]
[[Category:Interpreters (computing)]]


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