Wikipedia
Thoggen
Thoggen is a DVD ripper for Linux within the GNOME project. It is based on GStreamer and GTK+. Thoggen can back up DVDs by re-encoding them using the Ogg Theora video codec.
Thoggen is designed to be easy and straightforward to use. It attempts to hide the complexity many other transcoding tools expose and tries to offer sensible defaults that work well for most people most of the time.