Networking/Diagnostics
shareware ($37}
Website-Watcher
WebSite-Watcher checks an unlimited number of web-sites for updates and changes with a minimum of time and online-costs. When changes in a website are detected, it saves the last two versions to your hard disk and highlights all changes in the text.
freeware
Bopup Scanner
Bopup Scanner is a freeware network scanner that displays active computers with logged user names (NetBIOS), MAC and IP addresses. Bopup Scanner also recognizes and shows HTTP (Web) servers running on remote computers (TCP ports 80, 8080), quickly detects online computers, allows to browse shared resources of remote computer and save results to a text file. Advanced users can enter IP range to scan, specify a timeout to resolve a remote host and run the program from a command line interface.
shareware ($30}
BWMeter
BWMeter is a powerful bandwidth meter and monitor which measures and displays all traffic on your network. It can analyze the data packets (where they come from, where they go, which port and protocol they use). This makes it possible to distinguish between local and internet traffic for example. It can create statistics for all computers in your network, measuring and displaying all internal network traffic as well as download and upload from the internet. You can even define filters which show your...
open source
Wireshark
Wireshark (formerly Ethereal) is a network protocol analyzer for Unix and Windows. It allows you to examine data from a live network or from a capture file on disk. You can interactively browse the capture data, viewing summary and detail information for each packet. Has several powerful features, including a rich display filter language and the ability to view the reconstructed stream of a TCP session.