https://handbrake.fr/
win, mac, linux
you can install libdvdcss separately for decryption
For archive and 1:1 copies
https://www.videohelp.com/software/DVD-Decrypter
when you use DVD Decrypter it might mess up how your drive works even after closing the app so reboot is sometimes necessary after using it
for decryption, works with blueray as well "free for now"
simple to use but not much options to use
win, mac, linux
https://makemkv.com/
https://www.dvdshrink.org/
Legacy, can shrink the 8GB dvd to 4,7
virtual drive, useful for mounting images
https://wincdemu.sysprogs.org/download/
tools for modifying mkv, for example combining videos
https://mkvtoolnix.download/
videotool for mkv and other stuff, legacy but might be useful for something
https://avidemux.sourceforge.net/
for osx better to install from brew
DVD subtitle extractor to VobSub (idx/sub) file format
https://www.videohelp.com/software/VSRip
will extract idx and sub files
SubExtractor converts subtitles from DVDs and PGS (Bluray .sup) files into Advanced Substation Alpha (ASS) or SRT text format using a simple OCR.
https://www.videohelp.com/software/SubExtractor
This is a bit of legacy software, not recommended
probably the most useful subtitle editor has OCR features as well https://www.nikse.dk/subtitleedit](https://www.nikse.dk/subtitleedit)
https://www.videohelp.com/software/gMKVExtractGUI can extract data from mkv, for example if you used makemkv to rip dvd's you can use this to extract the subtitles
example flow
use makemkv to rip the dvd
mkvextract to get the subtitles
subtitle edit to convert the file with OCR