Ansible Core 2.13 - shipped with some modules, plugins (battery included)
Ansible Content Collections - additional modules, plugins and roles not included in Ansible Core
Automation Content Navigator - ansible-navigator; this tool replaced ansible-playbook, ansible-galaxy etc.
Automation Execution Environment - a container image that include Ansible Core, Ansible Content Collections, any Python libraries and other dependencies.
Automation Controller - formerly Ansible Tower;
(private) Automation Hub - non-public version of Ansible galaxy