windows utilities

psexec is a useful tool to execute programs/commands on remote windows machines . psexec is part of a package called pstools that contains other useful tools.

In fact there are several useful utilities like tcpview similar to netstat but with a graphical interface, process explorer that is very useful to figure out which program has a particular file or directory open, hex2dec to convert hexadecimal to decimal and vice versa, and others.
For more information consult the microsoft Windows SysInternals webpage.