Editing Common Lisp (section)

==Applications==
{{Category see also|Common Lisp (programming language) software}}

Common Lisp is used to develop research applications (often in [[Artificial Intelligence]]), for rapid development of prototypes or for deployed applications.

Common Lisp is used in many commercial applications, including the [[Yahoo!]] Store web-commerce site, which originally involved [[Paul Graham (computer programmer)|Paul Graham]] and was later rewritten in [[C++]] and [[Perl]].<ref>{{cite web|url=http://www.paulgraham.com/avg.html|title=Beating the Averages|website=paulgraham.com}}</ref> Other notable examples include:

* [[ACT-R]], a cognitive architecture used in a large number of research projects.
* Authorizer's Assistant,<ref>{{cite web|url=http://www.aaai.org/Papers/IAAI/1989/IAAI89-031.pdf |archive-url=https://web.archive.org/web/20110604051110/http://www.aaai.org/Papers/IAAI/1989/IAAI89-031.pdf |archive-date=2011-06-04 |url-status=live|title=Authorizer's Assistant|website=aaai.org}}</ref><ref>[http://www.prenhall.com/divisions/bp/app/alter/student/useful/ch9amex.html American Express Authorizer's Assistant] {{webarchive|url=https://web.archive.org/web/20091212141726/http://www.prenhall.com/divisions/bp/app/alter/student/useful/ch9amex.html |date=December 12, 2009}}</ref> a large rule-based system used by American Express, analyzing credit requests.
* [[Cyc]], a long running project to create a knowledge-based system that provides a huge amount of common sense knowledge.
* [[Gensym G2]], a real-time expert system and [[business rules engine]]<ref>[http://www.gensym.com/platforms/g2-standard/ Real-time Application Development] {{Webarchive|url=https://web.archive.org/web/20160802230335/http://www.gensym.com/platforms/g2-standard/ |date=August 2, 2016}}. Gensym. Retrieved August 16, 2016.</ref>
* Genworks GDL,<ref>{{cite web |url=http://www.genworks.com |title=Genworks GDL}}</ref> based on the open-source Gendl kernel.
* The development environment for the ''[[Jak and Daxter]]'' video game series, developed by [[Naughty Dog]].
* [[ITA Software]]'s low fare search engine, used by travel websites such as [[Orbitz]] and [[Kayak.com]] and airlines such as [[American Airlines]], [[Continental Airlines]] and [[US Airways]].
* [[Mirai (software)|Mirai]], a 3D graphics suite.
* Opusmodus is a music composition system based on Common Lisp, used in [[Computer assisted composition]].<ref>{{cite web |url=https://opusmodus.com/ |title=Opusmodus – Home}}</ref> 
* [[Prototype Verification System]] (PVS), a mechanized environment for formal specification and verification.
* PWGL is a sophisticated visual programming environment based on Common Lisp, used in [[Computer assisted composition]] and sound synthesis.<ref>[http://www2.siba.fi/PWGL/ PWGL – Home] {{Webarchive|url=https://web.archive.org/web/20110503155621/http://www2.siba.fi/PWGL/ |date=May 3, 2011}}, Retrieved July 17, 2013.</ref> 
* Piano, a complete aircraft analysis suite, written in Common Lisp,<ref name="lisp-lang.org">{{cite web|url=http://lisp-lang.org/success/aero/|title=Aerospace – Common Lisp|website=lisp-lang.org}}</ref> used by companies like [[Boeing]], [[Airbus]], and [[Northrop Grumman]].<ref>{{cite web |url=http://www.lissys.demon.co.uk/users.html |title=Piano Users, retrieved from manufacturer page}}</ref>
* [[Grammarly]], an English-language writing-enhancement platform, has its core grammar engine written in Common Lisp.<ref>{{cite web |url=https://tech.grammarly.com/blog/running-lisp-in-production |title=Grammarly.com, Running Lisp in Production |date=June 26, 2015}}</ref>
* The [[Dynamic Analysis and Replanning Tool]] (DART), which is said to alone have paid back during the years from 1991 to 1995 for all thirty years of [[DARPA]] investments in AI research.
* [[NASA]]'s [[Jet Propulsion Lab]]'s "[[Deep Space 1]]", an award-winning<ref>{{cite web|url=https://ti.arc.nasa.gov/tech/asr/groups/planning-and-scheduling/remote-agent/|title=Remote Agent|website=ti.arc.nasa.gov}}</ref> Common Lisp<ref>{{cite web |url=http://www.flownet.com/gat/jpl-lisp.html |title=Lisping at JPL}}</ref> program for autopiloting the [[Deep Space One]] spaceship. 
* SigLab, a Common Lisp platform for signal processing used in missile defense, built by [[Raytheon]].<ref name="lisp-lang.org"/>
* NASA's [[Mars Pathfinder]] Mission Planning System.<ref>{{cite web|url=https://franz.com/success/customer_apps/scheduling/nasa.lhtml|title=Franz Inc Customer Applications: NASA|website=franz.com}}</ref>
* SPIKE, a scheduling system for Earth or space based observatories and satellites, notably the [[Hubble Space Telescope]],<ref>[http://www.stsci.edu/resources/software_hardware/spike/ Spike Planning and Scheduling System]. Stsci.edu. Retrieved July 17, 2013.</ref> written in Common Lisp.<ref>{{cite web|url=https://franz.com/success/customer_apps/scheduling/sti.lhtml|title=Franz Inc Customer Applications: Space Telescope Institute|website=franz.com}}</ref>
* Common Lisp has been used for prototyping the garbage collector of Microsoft's [[.NET Framework|.NET]] [[Common Language Runtime]].<ref>{{cite web|url=https://blogs.msdn.microsoft.com/patrick_dussud/2006/11/21/how-it-all-startedaka-the-birth-of-the-clr/|title=How It All Started…AKA the Birth of the CLR|website=microsoft.com|date=August 28, 2023 }}</ref>
* The original version of [[Reddit]], though the developers later switched to [[Python (programming language)|Python]] due to the lack of libraries for Common Lisp, according to an official blog post by Reddit co-founder [[Steve Huffman]].<ref>{{cite web |last1=Huffman |first1=Steve |title=on lisp |url=https://redditblog.com/2005/12/05/on-lisp/ |website=Upvoted |access-date=May 11, 2019 |archive-url=https://web.archive.org/web/20180517155308/https://redditblog.com/2005/12/05/on-lisp/ |archive-date=May 17, 2018 |url-status=dead}}</ref> The reddit v1 source code has been open-sourced and modernized.<ref>https://github.com/tamurashingo/reddit1.0/ </ref>

There also exist open-source applications written in Common Lisp, such as:

* [[ACL2]], a full-featured [[automated theorem prover]] for an [[applicative programming language|applicative]] variant of Common Lisp.
* [[Axiom (computer algebra system)|Axiom]], a sophisticated [[computer algebra system]].
* [[Maxima (software)|Maxima]], a sophisticated [[computer algebra system]], based on Macsyma.
* [[OpenMusic]], an object-oriented visual programming environment based on Common Lisp, used in [[computer assisted composition]].
* Pgloader,<ref>{{cite web |url=https://pgloader.io/ |title=Pgloader}}</ref> a data loader for [[PostgreSQL]], which was re-written from Python to Common Lisp.<ref>{{cite web |url=https://tapoueh.org/blog/2014/05/why-is-pgloader-so-much-faster/ |title=Why is pgloader so much faster|date=May 14, 2014 }}</ref>
* Stumpwm, a tiling, keyboard driven X11 Window Manager written entirely in Common Lisp.