System Administration Tools

AdminToolsLauncher - Starter Application for most windows tools requiring administrative rights. Operating system: Windows XP/2000/Server 2003.
ClamWin - is a Free Antivirus for Microsoft Windows 98/Me/2000/XP and 2003. ClamWin Free Antivirus comes with an easy installer and open source code. You may download and use it absolutely free of charge
Daphne - is a small (system tray) application for killing, controlling and debugging window's processes. You can kill a process by dragging the mouse over the windows, by right-clicking the process in the main process list, or by typing its name with the "Kill all by name" command. You may download and use it absolutely free of charge
GLPI - is the Information Resource-Manager with an additional Administration- Interface. You can use it to build up a database with an inventory for your company (computer, software, printers…) Operating system: OS Independent.
GrepWin - is a simple search and replace tool which can use regular expressions to do its job. This allows to do much more powerful searches and replaces. Since regular expressions can sometimes get complicated, grepWin allows you to bookmark your most used expressions.
Nmap -is a free open source utility for network exploration or security auditing. It was designed to rapidly scan large networks, although it works fine against single hosts. Nmap uses raw IPpackets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics.
TrueCrypt - is an open-source disk encryption software for Windows Vista/XP/2000 and Linux. It is a software system for establishing and maintaining anon-the-fly-encrypted volume (data storage device). On-the-fly encryption means that data are automatically encrypted or decrypted right before they are loaded or saved, without any user intervention.
Webmin - is a web-based interface for system administration for Unix. Using any modern web browser, you can setup user accounts, Apache, DNS, file sharing and much more. Webmin removes the need to manually edit Unix configuration files like /etc/passwd, and lets you manage system from the console or remotely.
Wireshark - is the world’s foremost network protocol analyzer. It supports hundreds of different protocols, multiple platforms, and can analyze VoIP traffic. Operating system: Windows, Linux/Unix, OS X, Solaris, All BSD Platforms.