Sub2Srt

Sub2Srt is a very easy to use application that allows you to convert SUB subtitle files to SRT with the help of several configuration settings.
The interface is very clean and straightforward, with most of the options you need when converting subtitle files placed right in the main window.
Once you open a SUB file, you can adjust the framerate and the delay, if any, with dedicated fields to configure the line count, the maximum characters per line and the sum chars. Plus, you can optimize the file by picking the DVD player model you're using or the PC.
Unfortunately, the number of supported DVD models isn't impressive, so this is one of the areas that need to be improved in the future.
Of course, the main window is also being used to display the content of both files, while options placed at the bottom of the window give you the power to switch between uppercase and lowercase.
As you can see, Sub2Srt is pretty easy to use, so it shouldn't be too much of a problem that it doesn't feature a help file. Everything's pretty intuitive, so beginners should have absolutely no problem when using it.
Obviously, the footprint on hardware resources is minimal and Sub2Srt works just fine no matter the Windows version on your computer, which makes it appropriate for both older and newer systems.
All in all, Sub2Srt is a good tool, but there are still some areas to be improved in the next versions. It is safely addressed to all types of users though.