Submission to 2017 is open.
@pholser and @sils are winners in 2016 with pholser/junit-quickcheck (Java) and coala/coala (Python) projects. They got a cash prize of $2,048 each. More details.
@gvlasov is a winner in 2015 with gvlasov/inflectible Java project and a cash prize of $4,096. More details.