Nmap is a utility for network exploration or security auditing. It supports ping scanning (determine which hosts are up), many port scanning techniques, version detection (determine service protocols and application versions listening behind ports), and TCP/IP fingerprinting (remote host OS or device identification). Nmap also offers flexible target and port specification, decoy/stealth scanning, sunRPC scanning, and more. Most Unix and Windows platforms are supported in both GUI and commandline modes. Several popular handheld devices are also supported, including the Sharp Zaurus and the iPAQ.
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Monitorix is a free, open source, lightweight system monitoring tool designed to monitorize as many services as possible. At this time it monitors from the CPU load and temperatures to the users using the system. Network devices activity, network services demand and even the devices' interrupt activity are also monitored, and more. The current status of any corporate server with Monitorix installed can be accessed via a web browser.
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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.It was designed for Debian and Ubuntu servers, but can be useful for any Linux system.
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This tutorial will explain some useful commands to manage apache2 sites and Modules
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This tutorial describes how you set up a computer as a dedicated VPN server for your network. With a VPN server you can open secure data tunnels and access files and deivces in your local network (eg. home or office) from remote locations, which is not only a pretty cool thing (accessing your media library from anywhere) but also very handy for system maintenance or customer support or if you want to work from home.