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Sumo List Builder is a part of a suite of tools developed by Appsumo. List Builder also comes with exit-intent technology similar to OptinMonster. The free version allows a few customizations but for advanced features like A/B Testing you will have to subscribe to their paid plans.
This is a free opt-in plugin from the Wordpress community that provides a high level of customization. It is not as easy to integrate as the other tools, but its free and has good community support. It provides all the standard opt-in features and integrates with a variety of email marketing solutions.