Oracle

Rocky Mountain Oracle Users Group

DBA Support 

Oracle FAQS

Oracle Base

Connor McDonald (The Spoken Nerd podcast)

Maria Colgan

Jonathan Lewis

Tanel Poder

Christian Antognini

Kerry Osborne

Cary Milsap

AskTom

Kellyn Pot'Vin Gorman

SQL Server

SQL Server Central

Steve Stedman

Brent Ozar