Buck-Security is a security scanner for Debian and Ubuntu Linux. It helps you to harden your system by running some important security checks. For example, it finds world-writable files and directories, setuid and setgid programs, superuser accounts, and installed attack tool packages. It also checks your umask and checks if the sticky bit is set for /tmp, among other checks.
SecQua is a tool that quantifies the security of a given Information System, using a novel security metric. It tries to provide a deterministic, unbiased, objective, and efficient measurement. The approach is vulnerability driven and uses the National Vulnerability Database. A security metric must answer questions such as "How secure am I?", "Am I better compared to my last checkpoint/year?", "Am I spending the right amount of money for security?", "How do I compare to my peers?", and "What risk transfer options do I have?". SecQua can state that a system is now 60.2% secure, when last month it was 46.5%. Moreover, it tries to depict how vulnerability patterns expose the information system over time.