[RipperJax]

What if toy don't have those VOB's? I there a possibility to make an idx/sub subtitle out of a, for instance, *.srt text file?

[zohar_yd]

The recommended place to look for such program is www.doom9.org

Here is a list of subtitles tools you can download there:

CCParser 0.05b - parses Close Captioning DVDs
DVD subtitle converter - converts Micro DVD Player files to .sup (IfoEdit) format. Webpage
MaestroSBT - Converts subtitles from SSA scripts to formats readable by DVD Maestro, Scenarist,I-Author and submux. Renders the bitmaps.
S3 Subtitle Converter 0.05b - converts I-author to Scenarist subtitles, tutorial included
Sub2stl - converts MDVDP and SubRip files to the stl format (native Maestro format)
Subadjust 1.56 - adjust subs, split subtitle files and convert subtitle files
SubCreator 1.2 - create and adjust subtitles with online preview
SubRip 1.17.1 - the most uses subtitle ripper. Website
Subripper -> Scenarist Scenarist Coverter 0.1 - converts .srt to .sst
SubSynch 0.2.11 - subtitle synching helper utility
Subtitle Workshop 2.51 - complete subtitle creation, editing and conversion tool supporting 40+ subtitle formats. Webpage
SubToSup - convert VobSub files to sup (IfoEdit DVD authoring format)
SubWizard 1.3.6 - converts srt files to Subtitle creator / StreamWeaver or DVD Fusion format.
VirtualDub subtitle plugin - to add ssa subs to an AVI
VobSub 2.23 - another subtitle plugin for VirtualDub & Avisynth and DS filter for subtitle overlay during playback.
WinSubMux 0.2.0.2 - adds subtitles to an SVCD stream.