REFINITY is a workbench for modeling statement-based program transformation rules using abstract programs, based on Abstract Execution. It provides GUI support for creating models, and sends proof obligations to the KeY program prover to prove correctness of the transformation model. Once created proof certificates can be saved and validated.
The KeY framework is in its core a deduction-based program prover for Java. It is used for research and teaching, and supports functional verification, symbolic debugging, information-flow security, automatic test case generation and more. I have been massively contributing to KeY since 2015. Due to my implementation of Abstract Execution based on KeY, the system can now also prove universal second-order program properties (using abstract programs).