Seaside http://seaside.st/ is a web framework in Smalltalk that will run on Pharo (and a number of other smalltalk systems).

Also they have a GUI system ready so you can develop desktop apps (I'm not sure what the deployment story is like these days, but I assume it's fine).

Is a generic purpose language, and there are generic usages, and a lot of examples :) But here you have a huge SaaS made with Pharo: https://yesplan.be/en, and here you have a small mobile app made also with Pharo: https://plc3000.com [edit] technically is not a mobile app, but runs in any browser so... yes :P

Here is another web application made with http://pharojs.org which runs on Pharo https://covid.cs.ryerson.ca/compare/