Sent – A unified API for sending messages across SMS, RCS, and apps like WhatsApp.

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Open Source Customer Communication Platforms using Upstash

A curated collection of the best open source platforms for managing communication with customers across multiple channels. using Upstash.

Novu

Multi-channel notification infrastructure for apps

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39,025
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4,293
Last commit
5 hours ago

Open-source platform for building in-app, email, push, SMS, and chat notifications with a unified API, workflow engine, and embeddable inbox component.

Open Source Alternative to:

Customer.io

Cossistant

AI-native support infrastructure for modern SaaS

Stars
665
Forks
37
Last commit
4 days ago

Open-source support platform combining AI and human agents. React components with shadcn/ui design philosophy, styled with Tailwind CSS for NextJS apps.

Open Source Alternative to:

Zendesk

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