Maybe I am a bit dense but you seem to be asking about 2 different things. Do you want to create a DVD using unprocessed linear video (DVD Authoring)? i.e. Make a DVD out of raw footage. Or do you want to take existing movies and make a copy of them. i.e. rip and encode "Before Sunset" onto a new disc.
I think you mean the former in which case I don't know of any that are free. Final Cut Pro is probably the most economical "pro" tools I know of for the Mac. Well, truth be told I do not know of any other but there probably are. Loiking through MacUpdate did not bring up any likely candidates.
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