I recently noticed this new course created by Johns Hopkins. It offers a free certificate: Measuring and Maximizing Impact of COVID-19 Contact Tracing
You may be familiar with their other course about which I created a thread here: A New Course with Free Certificate: COVID-19 Contact Tracing
The new course mostly addresses managers and developers of contact tracing programs. As stated in the FAQ section, “you will need to enroll via a web browser on either a computer or a mobile device and not via the Coursera mobile app to enroll for the course and certificate for free. Unfortunately, the promotional price is not redeemable through the mobile app”.
I hope you enjoy it.