SubRip

Utility to convert subtitles from DVD-Video or AVI to textual form.

SubRip 1.40 beta 4 is a DVD Ripper.
SubRip is a software which allows you to rip DVD subtitles with their timing as a text file.

Can also convert vobsub(sub and idx) to srt text subtitles(vobsub to srt / sub to srt). The license of this video & dvd software is Free Software.