Application release automation (ARA) tools help firms release software consistently and in an automated fashion as a key part of getting business technology solutions to end customers. This report tells I&O pros how to choose the best vendor for their ARA needs by looking for ARA tools that can automate the modeling, packaging, and deployment of application releases and their associated configurations and that have built-in connections with existing modern service delivery tools.This is an update of a previously published report; Forrester reviews and revises it periodically for continued relevance and accuracy. We are now updating it to reflect changes in vendors and their solutions.