Mkv2vob is described as 'Converts mkv files and srt subtitles into a format readable by the Playstation 3. Doesnt exist for Mac. Doesnt encode but just does "muxing" so is much faster than the Video Converters for Mac that I have tested'. There are four alternatives to Mkv2vob for Mac, Windows, Linux and BSD. The best alternative is MKVToolnix, which is both free and Open Source. Other great apps like Mkv2vob are Subler (Free, Open Source), tsMuxeR (Free, Open Source) and gotsent (Free).
MKVToolnix is a set of tools to create, alter and inspect Matroska files under Linux, other Unices and Windows. They do for Matroska what the OGMtools do for the OGM format and then some. The latest builds now have the ability to create WebM compliant Files.
Subler is a Mac OS X application that opens media containers, allows you to add or remove media tracks inside them, and then saves them out again. In the specialized language of the video world, Subler is a “transcoder” or “demuxer” depending on how you use it.