TCPConnectProblemView is a tool for Windows that monitors the TCP connections on your system and displays an alert when software tries to initiate a TCP connection, and there is no response from the server.
WifiInfoView will quickly scan all the wireless networks in your area and then provide you with extensive information about them; great for diagnosing a connectivity issue or locating your router's model number, and more.
SterJo NetStalker network monitoring software protects your PC from any unwanted internet activity by watching TCP and UDP connections and applications running on your PC.
Complete Internet Repair does exactly what it says. It attempts to repair everything internet-related, including networking problems. Video tutorial and a portable version are also available.
Complete Internet Repair Portable does exactly what it says. It attempts to repair everything internet-related, including networking problems. An installer and a video tutorial are available.
VOVSOFT Network Alarmer allows you to check the availability of network devices using their IP addresses and can send automatic phone calls or email notifications in case of issues.
ChrisPC DNS Switch makes DNS changes more easily and lets you choose the one that fits your browsing habits from a series of alternative DNS. ChrisPC DNS Switch Pro also available.