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`Mesa demos collection <https://gitlab.freedesktop.org/mesa/demos>`__
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includes several utility routines in the ``src/util/`` directory.
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`Piglit <https://piglit.freedesktop.org>`__
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is an open-source test suite for OpenGL implementations.
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`ApiTrace <https://github.com/apitrace/apitrace>`__
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is a project to trace, analyze and debug graphics api's.
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`Valgrind <http://www.valgrind.org>`__
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is a very useful tool for tracking down memory-related problems in
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`Coverity <https://scan.coverity.com/projects/mesa>`__
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provides static code analysis of Mesa. If you create an account you
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can see the results and try to fix outstanding issues.