/ 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 Motionity - The web-based motion graphics editor for everyone if
Its stated focus is closer to your workflow: Create animated videos for free with Motionity, an open source motion graphics editor with keyframing, masking, filters, text animations, and more.