ASDF (A Simple DVD Frontend for MPlayer) is intended to make watching DVDs with MPlayer easier. It's written in Perl using the Qt toolkit. It provides an easy way to select the track you want to watch, as well as audio and subtitle languages and deinterlacing. It also provides a way to hide the short "empty" tracks that litter many DVDs.
ucview is a video image capture application that uses the unicap toolkit. It provides a simple way to parametrize the video device, can capture still images from the video stream, or record the stream as an MPEG file. By using unicap, it can access many different video capture devices like webcams, video grabber boards, IEEE-1394 (FireWire) cameras, and others.