Capability Maturity Model Integration - Wikipedia
Actually a good summary of the history and current version.
Agile-CMMI
Agile-CMMI V2.0 alignment: Bringing to light the agile artifacts pointed out by CMMI
$24 - is it worth it? Yes. Useful 2022 paper showing differences between CMMI v1.3 and 2.0 and mapping agile artifacts to both. Other info currently on the web is geared toward large organizations adopting CMMI and Agile and is completely overwhelming for small organizations.
CMMI FAQ - brutally honest, totally hip, no nonsense answers (a public service of Entinex)
Just search for Agile in this incredibly long FAQ. This URL actually puts you at one of those Agile and CMMI explanations, but there are more if you search.
(11) Agile CMMI | Groups | LinkedIn
Use the LinkedIn group to find people you trust to talk CMMI and Agile. Or ask Mark Kilby.