Web-CAT
Web-CAT is an automated programming assignment grading system developed at Virginia Tech with a focus on grading using student-written tests. It has support for C++ and Java, and was primarily developed by Stephen Edwards and is licensed under the AGPL.
Most Computer Science courses that use automated grading now use Web-CAT.
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Criticism
Many students have complained of problems with Web-CAT, due to features like style-checking on by default without any listed style guidelines, and have cited the project's large number of unresolved bugs[1]. Often, when students complain of problems, they are told that because Web-CAT is open source, they should simply fix the problem themself instead of complaining.
Other students have cited slow grading and a difficult-to-use user interface as making Web-CAT incredibly frustrating to use.