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Automating the process of software testing is a very popular research topic and of real interest to industry. Test automation can take part on different levels, e.g., test execution, test case generation, test data generation. This survey gives an overview of state-of-the art test data generation tools, either academic or commercial. The survey focuses on white- and gray-box techniques. The list of existing tools was filtered with respect to their public availability, their maturity, and activity. The remaining seven tools, i.e., AgitarOne, CodePro AnalytiX, AutoTest, C++test, Jtest, RANDOOP, and PEX, are briefly introduced and their evaluation results are summarized. For the evaluation we defined 31 benchmark tests, which check the tools capabilities to generate test data that satisfies a given specification: 24 primitive type benchmarks and 7 non-primitive type and more complex with respect to the specification …