Webcamoid - Webcamoid is a full featured webcam capture application.
MyCam - Record videos and take pictures with your webcam, open image or video files and apply with amazing photo filters and video effects.
Kamoso - Kamoso is a webcam recorder from KDE community.
Cameroid - Just like Photo Booth - exept is online. Have fun with your webcam. Apply text and funny effects.
Phoyo - Phoyo is a photo booth automation software.
GTK+ UVC Viewer - guvcview is a video viewer and capture software for the linux UVC driver.