Atlanta Linux Enthusiasts (ALE)
http://ale.org/
Atlanta Tableau Users Group
https://community.tableau.com/groups/atlanta
Atlanta VMware Users Group (VMUG) (free)
https://community.vmug.com/communities/localcommunityhome?CommunityKey=8c7c9b52-d130-4dcc-9ee3-cc554d0c02ae
DevOpsATL (Free)
https://www.meetup.com/DevOpsATL/