Security Engineering Course
lightbluetouchpaper.org
lightbluetouchpaper.org
They're hosted on edX. Like many edX courses, if you want to prove you learned the material you can pay to try to pass various tests and get a certificate, but you do not need to pay if you just want to learn the material.
Full disclosure: I'm the author. But hopefully you'll like it anyway :-).
Regarding secure software development, I've not seen many certs / exams covering the topic, so it's good you've developed those 3 courses. The only other cert I've seen is the CSSLP by (ISC)2:
https://www.isc2.org/Certifications/CSSLP
Can you comment on how they compare?
Not in order to make people experts, but eg security for the working web engineer?
Now if you really want to be in research and current attack/defense then you need to do your homework.
But all the foundations in this book will help you have a comprehensive picture of the landscape you're playing in.