https://clisp.sourceforge.io/
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Boeing 747 and 777 use Allegro NFS Server written in Common Lisp. Further on the subject of aviation: Boeing and Airbus use Piano – a software package in Common Lisp for aircraft design development and analysis. You can learn more about the low-level programming in Common Lisp from https://m.youtube.com/watch?v=S7nEZ3TuFpA
London Tube that uses the software developed by Portuguese Siscog where Common Lisp is the main programming language. The company develops decision support systems designed for resource planning, allocation, and management in the transportation sector
ITA Software is the once independent company that developed the system for air tickets search and pricing. Now it forms part of Google’s travel industry department. In most cases, the company develops its software using Common Lisp
AutoCAD use the AutoLISP dialect as the internal application development language. Though AutoLISP is the oldest of internal programming languages in AutoCAD, it is actively supported and is available for development in other CAD systems (Bricscad, IntelliCAD, DraftSight)
Hacker News was developed as a project of Y Combinator and is written in Arc. This is a Lisp dialect implemented in Racket. The site author, Paul Graham, also took part in the development of this language and, as you can see, has found a practical use for it. One of the goals was to create a community similar to that formed on Reddit in its early days (surprisingly, at that time it was written in Common Lisp as well until it was migrated to Python in 2005).

https://github.com/azzamsa/awesome-cl-software
https://github.com/projectured/projectured/wiki/Screenshots https://m.youtube.com/@projectured/about