GtkSubRipper is a dvd subtitle extraction tool written in C with the Gtk2 toolkit. It reads unencrypted vob files and outputs .srt/.sub files, suitable for use with divx movie players. It is based on the sources of the windows subripper application.
Installation
cvs -z3 -d:pserver:anonymous@gtksubripper.cvs.sourceforge.net:/cvsroot/gtksubripper co -P gtksubripper