The Italian Covid contact-tracing app is now developed in open source
Some other countries recently took same path, relevant discussion here :1) Singapore : https://news.ycombinator.com/item?id=227027012) India : https://news.ycombinator.com/item?id=233112983) Germany : https://news.ycombinator.com/item?id=23376682 ( no discussion, link to repository )4) France : https://news.ycombinator.com/item?id=23321137