Flight search (Google's ITA Software), underground planning (SISCOG), CAD software (PTC Creo et all), the Gollum face (Mirai), automation of document extraction, renewable energies resource planning (3E), project management (planisware),

games (Kandria),

Maxima,

a faster pgloader (https://tapoueh.org/blog/2014/05/why-is-pgloader-so-much-fas...),

hackernews (was rewritten to SBCL: https://lisp-journey.gitlab.io/blog/hacker-news-now-runs-on-...), first reddit…

https://lisp-screenshots.org/

https://www.lispworks.com/success-stories/

also Emacs (for another dialect).

The aqueducts!