Most of my “family” apps is just quick hacks in JavaScript. Simple to throw together, runs on everything with a browser, like the tv, and is easily published on anything serving static files, like github pages.
Edit: For some more hobby like projects C# works out quite nicely though. I’d say it’s probably easier to stick with the beaten path here if not seeing a particular advantage from a functional language. I hear F# is quite nice as far as a functional languages go though.
I've been wanting for a while a lightweight Electron alternative that doesn't use web views, just native APIs, and uses Lua instead. So it would be an .exe file that looks for a main.lua somewhere, and runs it, giving access to modules that wrap the Win32 API in high-level functionality. Then you could run a command that combines the .exe and the main.lua into a new .exe file that you can distribute. It would be super lightweight and wouldn't even need a compiler to be installed to be able to make tiny lightweight apps.