Alternatives to Twilio

Open source notification infrastructure

Novu is the notification infrastructure you'd build yourself if you had three months to spare. One API for email, SMS, push, in-app, and chat notifications — with a visual workflow editor, subscriber preferences, and digest/batching built in.

Open source WebRTC infrastructure

LiveKit is open-source WebRTC infrastructure that turns "build a video call feature" from a six-month project into a weekend. Real-time audio, video, screen sharing, and — this is the 2026 differentiator — a full AI agent framework that lets voice bots join rooms as participants.