Chalk

Chalk is low-latency video conferencing you can read the source of — and build on, through TypeScript, React, and React Native SDKs. It fills the gap between clunky open-source tools and expensive proprietary providers.

It runs on Cloudflare RealtimeKit with a Go control plane and an Elixir/OTP sync server, with a shared whiteboard built on Excalidraw. Core calling works; hosted product and docs are in progress.