Webcamoid
8.2#1 in webcam software$1.99 one-timeFree planAndroidAPILinuxmacOS
VisitNo prices published.
Webcamoid may suit people who want webcam controls and effects, desktop screen capture, or streaming destinations. Its virtual camera is relevant to GNU/Linux and Windows users, but not Android or Mac users.
You want what its maker publishes above — check its page for the details.