Mautic (open source)

Mautic Community Edition is an open source cross-channel campaign management software solution designed to enable users to build email, nurture campaigns, personalize messages, execute A/B tests, and measure results. The open source edition is community supported. Support is available for Acquia Campaign Studio, which is based on Mautic technology acquired by Acquia in May 2019. Acquia Campaign Studio is available on the Acquia Digital Experience Platform.