Wikipedia
Guvcview
Guvcview (GTK+ UVC Viewer) is a free software webcam application for the Linux desktop, started by Paulo Assis in 2008. The application is written in C.
Guvcview is compatible with all V4L2 camera devices, using the Linux UVC driver and based on luvcview for video rendering. Audio support employs the PortAudio open source library. The application's user interface is built using GTK+ and designed to be simple and easy to use.
The application has been noted as using fewer resources than other webcam applications, such as the GNOME standard webcam application, Cheese, and is an alternative to other webcam applications, including Apple Photo Booth and KDE Kamoso.