/ Choose Open-source Customer Engagement for Automated Messaging if
Its stated focus matches what you need: The open-source customer engagement platform for automating email, SMS, mobile push, WhatsApp, & more. Low-code customer segmentation, message templates, and a simple drag-and-drop journey builder.
/ Choose Plunk | The Open-Source Email Platform if
Its stated focus is closer to your workflow: Plunk is the open-source, affordable email platform that brings together marketing, transactional and broadcast emails into one single, complete solution