Current version: 1.52

DVDSubEdit allows you to visualize and make modifications to the subpics (subtitles or button highlights in menus) directly inside the VOB files, without the need to demux and remux the subpic stream..

For more info on what exactly DVDSubEdit does, go here.
To download, go here.
Version history is here.

Other tools by me (jeanl) can be found here...