Flawfinder
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Examines source code looking for security weaknesses.
5.
Guarded Memory Move (GMM)
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The GMM library can be used to prevent and study buffer overflows exploits
6.
Libsafe
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Free software (GNU license) from Bell Labs for protecting internet servers from buffer overflow attacks, one of the most commonly exploited security vulnerabilities.
7.
Samhain
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A tool for file integrity checking that optionally can be used as a client/server application for centralized monitoring of networked hosts.