KeY alternatives and similar libraries

Based on the "Formal Verification" category.

Checker Framework

6.2 9.8 L1 KeY VS Checker Framework

Pluggable type-checking for Java
Daikon

3.4 8.1 L1 KeY VS Daikon

Dynamic detection of likely invariants

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CATG

3.0 0.0 L1 KeY VS CATG

a concolic testing engine for Java
OpenJML

3.0 9.1 L1 KeY VS OpenJML

This is the primary repository for the source code of the OpenJML project. The source code is licensed under GPLv2 because it derives from OpenJDK which is so licensed. The active issues list for OpenJML development is here and the wiki contains information relevant to development. Public documentation for users is at the project website:
jCUTE

2.8 0.0 L1 KeY VS jCUTE

Java Concolic Unit Testing Engine
JMLOK 2.0

1.9 0.0 L2 KeY VS JMLOK 2.0

Tool for detecting and classifying nonconformances in Java/JML projects.
Java Path Finder (JPF)

- KeY VS Java Path Finder (JPF)

JVM formal verification tool containing a model checker and more. Created by NASA.
Krakatoa

- KeY VS Krakatoa

Krakatoa is a front-end of the Why platform for deductive program verification. Krakatoa deals with Java programs annotated in a variant of the Java Modeling Language (JML).
Java Modeling Language (JML)

- KeY VS Java Modeling Language (JML)

Behavioral interface specification language that can be used to specify the behavior of code modules. It combines the design by contract approach of Eiffel and the model-based specification approach of the Larch family of interface specification languages, with some elements of the refinement calculus. Used by several other verification tools.