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XJML 1.0 is a platform for Verification and Validation of Java classes
XJML 1.0 actually can reads one Java class and its contract (written in XML) and then executes the next verification techniques:
1. Runtime Assertion Checking (RAC). Using JML4c and JML4rt tools.
2. Extended Static Checking (ESC). Using ESC/Java2.
3. Full Static Program Verification (FSPV). Using the Why platform (tested with Why 2.30 and Why3 0.71)
C4J is a simple, powerful and non-intrusive tool that makes it easy to add contract verification of instances and methods of any Java class or interface, with full inheritance support. C4J brings Design By Contract to Java.
TUTU is an automated testing system which finds inconsistencies between a system and its specifications, by using a combination of a number of techniques, such as Design by Contract, test data generation, mutation testing and invariant detection.
CppCondite is a contract directed testing framework for C++. A formally specified "contract" (and a little human help) can be used to generate tests (similar to unit tests) verifying that a component implements the contract correctly.
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Design by Contract with seamless integration into the Spring Framework, based on Annotations, AOP and a pluggable Specification Language (supports Expression Language (EL) with Extensions, Groovy, OGNL out of the box).