Free
A free toolkit for network professionals with 11 essential tools
Available is a simple whois Applet that will probe any server on the Internet
How To Index A Website gets your site indexed quickly.
PingCOPA Network Tools for Windows.
Free IP scanner is a very fast IP scanner and port scanner.
Lookup DNS information using a convenient graphical user interface
Colasoft MAC Scanner is a scan tool using to scan IP/MAC address in subnets.