I use TCL in a consumer app that I develop, to allow users to load and run scripts that control the behaviour of the app. Its for controlling cameras (smart shooter), and actually I usually end up writing the scripts for my customers. But its amazing what you can achieve quickly and easily due to how flexible TCL is, users are amazing when I email back a custom script for some fancy HDR photo bracket the same day they request it!

And I myself am surprised at how many photographers have managed to write their own scripts, even non-programmers. I've been thinking about adding support for python as the scripting language, but I can't justify it just for been fashionable.