The German "Corona Warn App" (CWA) is pretty good from a privacy POV. It works along the same lines as the Google/Apple ones I think (trading tokens over Bluetooth, then publishing a list of "infected" tokens when you submit a positive test result, risk severity being based on how many tokens you match, i.e. how long you were in the same space). The difference is that it isn't tied to any American corporation.

Of course we also had another app called Luca, which tried to do a lot more direct contact tracing and turned out to be extremely insecure and leak user data, so there's that. And of course there were some plausible corruption allegations relating to its public funding.