OBS Studio

OBS Studio is open-source software for live streaming and screen recording, available free on Windows, macOS and Linux with no feature restrictions.

It is built around scenes and sources: a scene layers together camera feeds, window captures, images and text, and you can switch between scenes mid-stream. That structure lets a single operator produce something resembling a multi-camera broadcast.

Virtually every streaming platform accepts OBS — you only need the ingest URL and stream key. The downside is initial setup, which requires understanding bitrate, resolution and encoder settings; defaults rarely suit your specific machine and connection, so a local test recording before going live is worthwhile.