As best I am aware, many of the F-keys have no specific use outside development applications. About the only two that get used in widespread applications are F1 and F5. IDEs make good use of them for debugging, but that's about it.

Other 'Professional' software such as video editing or music production usually sticks to key combos rather than F-keys. This is traditionally why the F-key row is used for things like brightness or volume, and why Macs use these as the default function.