Hi, I found your project to be very interesting.

I have created a list of roughly 140 CVE and (free) Security Advisory resources in my project.
Links are verified and include many non-NVD joined/proprietary sources.

• My main focus is enterprise IT and OT.

https://github.com/BoaThor/CVE-Resources/blob/main/cve_resource_list_alpha_CSV

Maybe that is interesting for you.

Continue the awesome work :)

Cheers.