Injecting some love in the outdated linux topic
VobSub2SRT: command line OCR converting idx/sub subtitles into srt
https://github.com/ruediger/VobSub2SRT
Gaupol: text based subtitles editor
http://otsaloma.io/gaupol/
MakeMKV: DVD/BD decrypting and transcoding
http://www.makemkv.com/forum2/viewtopic.php?f=3&t=224
HandBrake: well known video encoder
https://handbrake.fr/
MKVToolNix: mkv tools (info, merge, extract)
https://mkvtoolnix.download/
libdvdcss: library for accessing encrypted DVDs
http://www.videolan.org/developers/libdvdcss.html
what do you need more? ooh yes... Debian of course
please add these in the first post as too many apps are outdated in that one