Varieties of Agile
Scrum: https://www.scrum.org/
Lean: https://www.lean.org/
Feature-Driven Development: http://www.agilemodeling.com/essays/fdd.htm
Extreme Programming (XP): http://www.extremeprogramming.org/
Scaling Agile
Scaled Agile Framework (SAFe): http://www.scaledagileframework.com/
Large Scale Scrum (LeSS): https://less.works/
Nexus: https://www.scrum.org/resources/scaling-scrum
Disciplined Agile (DA) Framework: http://www.disciplinedagiledelivery.com/
Other Helpful Links
Agile Manifesto: http://agilemanifesto.org/
Center of Enterprise Agility (CEA): https://share.cms.gov/cms-wide/governance/Agile/SitePages/LandingPage.aspx (CMS Employees Only)
Agile Videos of the Week