Change MAC Address
Very simple, small and free program to change the MAC address of a network card.
TCP/IP Manager
Easily keep track of network configurations in different locations and change them if needed with just one mouse click
PeerBlock
PeerBlock lets you control who your computer "talks to" on the Internet.
RedEyes
Remote host monitoring utility.
Advanced IP Scanner
Free Network Scanning Tool
Mr.IP
Displays your internet IP and can inform you when the IP has changed
IPManager
IPv4 IP Address Randomizer for Windows
IP Informer
Run auto or manual scans that return your routers IP address
BlindScanner
BlindScanner allows users to scan, using the remote scanner and to save images in folders (it is possible automatically by the timer).
NetSetMan
NetSetMan is a network settings manager which can easily switch between 6 different, visually structured profiles.
IP Changer
IP Changer is a utility program that eases the process of changing IP information to one or more network adapters.
PacketViewer
Easy program to sniff and view IP packets (TCP, UDP, ICMP).
AS-CopyIP
Request and copy your public IP Address
Angry IP Scanner
Angry IP Scanner (or simply ipscan) is an open-source and cross-platform network scanner designed to be fast and simple to use
IPConfig
The purpose of IPConfig is to provide a simple yet effective way of seeing your IP addresses; internal and external.