You'd be surprised. I have dealt with a large number of specialized software vendors and very few have websites of any usefulness.
There are a lot of small shops out there selling one of a few packages that everyone in the industry (whatever industry it is) uses and they have been doing it for 20 years. It's a different world. They are frequently making millions selling desktop software that's not very effective and without any marketing budget.
It's hard since so many don't have websites, but think about blue collar service industris (mechanics, plumbers, car washes, etc). Here's a company that kills it selling web based software to auto glass replacement facilities. It looks like it is out of 1995:
There are a lot of small shops out there selling one of a few packages that everyone in the industry (whatever industry it is) uses and they have been doing it for 20 years. It's a different world. They are frequently making millions selling desktop software that's not very effective and without any marketing budget.