I guess some use it for AI and machine learning, but those fields are outside my interests. You can do anything in Lisp which could be done in languages like C, C++, Java, Python, etc.

- web browser: https://github.com/atlas-engineer/nyxt

- web server: https://lispcookbook.github.io/cl-cookbook/web.html

- games: https://github.com/lispgames/lispgames.github.io/wiki

- command line utilities: https://stevelosh.com/blog/2021/03/small-common-lisp-cli-pro...

- more ideas: https://awesome-cl.com/ | https://www.cliki.net/Exercices