Relies on OBS Studio
Part of Zoom Obscura
Record loops of yourself to playback via a virtual webcam in a video call, allowing you to fake your presence.
All data, including videos, is stored locally only. No video data is sent to a server
Free and open source software for video recording and live streaming.
Bundled in the Windows version of Webcam Manager.
See also: Using OBS as a Virtual Webcam on Windows and MacOS