Angora, mutation-based coverage guided fuzzer was open sourced (github.com)

Research paper about Angora was published here: http://web.cs.ucdavis.edu/~hchen/paper/chen2018angora.pdf

The page doesn't answer the question most people would be asking: How is it better or different from AFL?

Edit: The linked paper has more information https://arxiv.org/pdf/1803.01307.pdf