VobEdit

VobEdit is a software which allows you to split, merge and demux video files in the VOB format (DVDs).
The tool doesn't require any installation. Your Windows registry entries will remain intact and you can also place VobEdit on an external device to run it on any computer.
The user interface of VobEdit consists of a plain window in which you can add VOBs by using the file browser (the "drag and drop" method is not supported).
On the right side of the screen you can view various information, including the pack identifier, pack stuffing length, video stream start code, PES HeaderData length, MPEG frame and frame content details (e.g. padding stream start code, length and frame).
From the "Edit" menu you can access functions to join VOB files, remux MPEG files, preview a clip in a built-in media player (with the possibility of navigating back and forth frame by frame within a video) and to get audio and video delay.
Furthermore, you can jump to a particular file in the list, correct VOB files, copy information to clipboard and enable several options (e.g. angle, button).
The program uses a low-to-moderate amount of system resources. However, it doesn't contain a help file and first-time users would probably get lost in VobEdit, since some functions do not come with any kind of explanation.
The bottom line is that VobEdit could certainly use some improvements when it comes to its interface and functionality.