A campaign asks the users of non-libre apps to report which ones report the user's location. There is no other straightforward way to make a list of those apps, and their developers can change their behavior at any time.

A nonfree program gives its developers power over its users, which makes it an injustice. I hope you don't use any non-libre apps, but if you do, it would be useful to report on them. You can do that and stop using them too.