Just about any project you do in Unreal is a C++ project and Unreal is used all over the place - in games but also in industrial design and architecture for demos and visualization.

I started a project (https://github.com/tedmiddleton/mainframe) last year to make a dataframe in C++ because I was running into some performance limits in Pandas. I’m not sure how useful a C++ dataframe is - but I imagine it as being an alternative to going all the way to Hadoop and spark if you’ve outgrown pandas.