Just updating a few things since this thread still pops up on searches.
Vidalin is discontinued according to
MacUpdate.
TagChimp is also no longer running.
http://www.tagchimp.com
MetaX appears to have been replaced by
MetaZ (
MacUpdate); MetaZ indicates a release in Nov 2013
A Windows Program called
ChapterGrabber seems to do well extracting the chapters (time and chapter number) from a VTS file, provided you choose the right one.
>> Is there a similar utility for the Mac?
Feed that information to
ChapterDB.org to share the info.
Using
ChapterDB.org, if you can find a DVD that has the correct chapter titles, copy the URL and past it in
this converter that will take a ChapterDB URL and save a csv file in your downloads folder. You can then import the chapter titles into Handbrake for a 'more complete' movie file.