I'm the initiator of https://cov19tech.org. I've started to collect information on the variety of contact tracing / exposure notification being built across the world. The website itself is open source (https://github.com/Cov19tech/cov19tech), all the content is Creative Commons licensed and I'm hoping to get interested users to help collect information on this rapidly evolving area of the tech world. Right now the content on the site is fairly sparse - largely a table summarizing the approaches of about 30 different apps as well as a couple of more detailed write-ups on some of the apps in draft form. I'll be adding write-ups on each app in the coming days. This will hopefully give technically-inclined folks a way to understand and evaluate how these are being implemented across the world. I'd like to see if there is interest in having such a resource available, as well as see if there are people who would like to help out. Eventually, I'd like to start covering more than just contact tracing apps - and have sections on other technologies that are being applied to helping stop the spread of COVID-19.
Please do share any thoughts/comments/feedback you have!