Free to use, sets up in twenty seconds. Install it on your PC, then get the TapCam app on your phone.
Run the installer and open TapCam. It shows a QR code on your Wi-Fi network.
Install the TapCam app on your phone, then scan the code to pair. Direct, no cloud.
Pick "TapCam" as the camera in Zoom, Teams, Meet, OBS or any app.
TapCam is not code-signed yet, so Windows shows a caution the first time you run the installer. It is safe to continue. Here is the exact sequence.
This only concerns the direct download. The Microsoft Store version is signed by Microsoft and shows no warning.
The phone app is a separate free download from the App Store and Google Play.