Open-source Twilio alternatives

LiveKit is an open-source platform for realtime audio, video and data, aimed at developers building voice, video and AI agent applications. This repository holds the LiveKit server, a distributed WebRTC selective forwarding unit (SFU) written in Go on top of the Pion WebRTC implementation.

People, devices and AI agents join the same room as participants, and agents can be dispatched into rooms automatically or on demand. The server offers speaker detection, simulcast and selective subscription, uses JWT for authentication, and handles UDP, TCP and TURN connectivity. SDKs cover web, mobile, desktop, embedded and server environments, and a separate Agents framework in Python and Node.js supports code-first voice agents.

The server ships as a single binary and can be deployed with Docker or Kubernetes on your own infrastructure under the Apache 2.0 license. The vendor also runs LiveKit Cloud, a managed service that handles deployment and observability.

OpenWA is an open-source WhatsApp API gateway for developers who want to own their messaging stack, with no lock-in to a vendor and no hidden paywalls. It exposes WhatsApp sessions through an API and webhooks so you can build bots, notifications and automation, and topics reference WhatsApp Web, indicating it works through that interface.

Its pluggable architecture lets you pick the database engine (SQLite or PostgreSQL), the storage backend for backups and migrations (local or S3) and the cache layer (disabled or Redis) through configuration rather than code changes. Message media is returned inline to API and webhook consumers and is not automatically stored in the backend. A React dashboard manages sessions, webhooks and API keys, and it can run multiple sessions at once.

OpenWA is written in TypeScript and licensed under MIT, with documentation and an API reference. Because it automates WhatsApp through an unofficial route, users should review WhatsApp's terms of service and the risk of account restrictions before relying on it for important accounts. It suits developers prototyping WhatsApp integrations and small-scale automation.

Fonoster is an open-source cloud communications platform presented as an alternative to Twilio. Its stated aim is a programmable telecommunications stack that lets businesses connect telephony services with the internet through a cloud-based utility, and the topics mention VoIP, WebRTC, UCaaS and CPaaS.

Main features include multitenancy, easy deployment of PBX functionality, programmable voice applications, a Node.js SDK, support for Amazon S3, secured API endpoints with Let's Encrypt, OAuth2 and JWT authentication, role-based access control, a plugin-based CLI and Google speech APIs. A voice application is a server process that drives a call using verbs such as Answer, Hangup, Play, Say, Gather, Stream, Dial, Record, Mute and Unmute, and everything in Fonoster is API first, including starting a call with the SDK.

Fonoster is written in TypeScript on Node.js and designed for Kubernetes deployments. It is licensed under MIT and aimed at developers and companies building voice bots, IVR systems and cloud phone features that they can run on their own infrastructure.

FreeSWITCH is a software-defined telecom stack that replaces proprietary telecom switches with software running on ordinary hardware, from a Raspberry Pi to a multi-core server. It is used to build voice and communications systems around standards such as SIP, WebRTC and VoIP.

The source code is available on GitHub and can be built for Linux, Windows, macOS and BSD, with an issue tracker and pull request workflow in the repository. Documentation, release notes and step-by-step installation tutorials from packages are published online. A mod_signalwire module included in the codebase links a FreeSWITCH instance to the SignalWire cloud platform.

SignalWire, founded by FreeSWITCH's original developers, is the primary sponsor and offers services such as SMS, SIP and programmable telecom that can extend a deployment. Teams that need commercially supported builds can contact the core team about professional services. The project is written in C.

CodeChat WhatsApp API is a server you run yourself that exposes WhatsApp messaging functions over a REST API. It is meant for building multi-service chats, support bots and other systems that use WhatsApp, and callers can work in any programming language because they only make HTTP requests.

The setup guide uses Docker for infrastructure, with PostgreSQL as a required database managed through Prisma migrations, Node.js installed through NVM and the process kept running with pm2. Configuration comes from an environment file copied from the provided development example. The project is written in TypeScript, released under the Apache-2.0 licence and documented on its own docs site.