Irism Rates Bobby
Get Bobby: www.cast.org/bobby/
Bobby quirks: if the alt attribute is set to null (alt=""), Bobby pops a message stating
one hasn't set alt attributes. alt="" should be ignored, because it indicates that a
image is a piece of junk that does not need description.
Bobby spews out a message if a form control does not have an explicitly-defined label element. "Explicitly associate form controls and their labels with the LABEL element." However, 508 does not require using a LABEL element. So technically, the form might not be in violation of Section 508.
Bobby has some benefits: when an error is spewed out, at least that error is generated as a link to a page with more information. At that point, one can figure out what Bobby is trying to do with that part of the web page.
In my view, however, what appears to be happening is that Bobby is hoping to drive conformance to 508 in a certain direction, according to what the designers of Bobby would like to see. That would certainly make it easier for Bobby to be the product of choice.