Novu just crossed 40,000 stars on GitHub.
It's open-source infrastructure for multi-channel notifications, in-app, email, push, SMS, chat, all behind one API with a workflow engine and an embeddable inbox component.
openalternative.co/novu
openalternative.co
Novu: Open Source Alternative to Customer.io, NotificationAPI and Courier
Open-source platform for building in-app, email, push, SMS, and chat notifications with a unified API, workflow engine, and embeddable inbox component.