Trace Together (Singapore)
The source code is available. There was a paper examining the source code of TraceTogether already when it is first launched. However, I don't think someone does the analysis on the updated version yet and I'm also not sure whether the code has been updated. With the new version, users have to re-register and provide more of their personal details such as ID number. The country also have the check-in and out system called SafeEntry, in which the technical part is not examined yet and no source code is available. They also have contact tracing wearables in place. All of their efforts raised privacy concerns in which the technical part is not examined/mentioned that much.