Things like backoffice code which are very specific to one business. Or something like the Javascript that ties together the widgets of a GUI. These types of th

Things like backoffice code which are very specific to one business. Or something like the Javascript that ties together the widgets of a GUI. These types of things are basically only useful in exactly the context they're currently being used. When your potential user base are people who'd like to run an exact clone of your business, open sourcing is not a good idea (EDIT: and it's potentially a social benefit to maintain your business's existence and unique identity). I guess you could step back and question the utility of your business altogether, but that's a separate consideration.