Modern methods of fuzzing?

Question

Software testing

Good afternoon! Actually interested in the direction of software fuzzing.
What are the ready-made tools for fuzzing (software [Applied, web applications], protocols, networks, etc.)? (I know about spike and speach)
Is there any good literature on the topic of fuzzing? (Preferably in Russian)
How is the completeness of the generated data determined? And how to enter the quality criterion? (This means the following. Here we have generated a data set for a certain variable. How to understand that data set A is worse than data set B?)