Advanced Administrative Tools for Windows
Advanced Administrative Tools for Windows is a great set of utilities for analyzing network properties. It will test pretty much every network operation you could want to know about. AATools will check Email properties, Scan ports and proxies, give network and system statuses, etc. The information it conveys is easy to digest and setting up a test is likewise very simple. A worthwhile download for anyone wanting to gather info on their network or PC. AATools should be a part of your security toolkit and you should employ them regularly.

NetVizor
NetVizor allows you to monitor user activities anywhere on your network. Here is a list of some of the awesome monitoring features NetVizor provides, keystroke logging and much more. Not only can NetVizor provide powerful monitoring over your network usage, but NetVizor can also allow for administration of users, or an entire network, with simple point and click commands.

Net-Vestigator
a program which offers you access to same databases used by professional investigators. Some of the information you will be granted access to is difficult for even government agencies to find! It's safe and legal to use, and best for all, it can be done without anyone ever knowing.

CSSS
Computer Sound Security System. The principle of action bases on microphone (microphones) real time survey and highly intellectual analysis of coming signals on the basis of special algorithms, and if it is necessary-calling you by modem (phone.

Network Smart Lite
NetworkSmart Lite will help you step inside the network wire and show you exactly how your application is operating across the network. It will help you determine performance bottlenecks and slow response times by analyzing how many times your application communicates with the server (known as round trips). NetworkSmart Lite also includes a simple performance rating that quickly tells you if your code or web page is performing well over the network. .

Asset Tracker for Networks
Inventory LAN PC's software and hardware, reduce cost of ownership, increase the efficiency of production, plan hardware upgrades and software licenses purchases.

IP Check
IPCheck constantly watches all your servers and notifies your staff when outages occur. Also all performance data gathered during monitoring can later be viewed and analyzed. IPCheck is designed to continuously monitor one or more servers. It alerts webmasters if a webserver is not working correctly because the web service is down, CGI scripts return errors or the SQL server is not reachable. IPCheck analyzes the results and notifies the administrator when problems are identified. Additionally it can constantly monitor servers by attempting to connect through a PING command or through a specific port (e.g. HTTP=80, SMTP=25).

NetGrid
NetGrid is a program that will monitor your Internet connection's upload and download bandwidth. With it's common graphical and numeric output that hides in your system tray, it gives you an accurate display of your bandwidth usage. .

DreamSys Server Monitor
Monitor servers over a network or the Internet. Connect, Receive, or Send & Receive tests on TCP connections. Simple Ping tests. Test services on remote machines, and restart services if necessary. Quick and Easy to use Windows interface. Save/Load host lists as separate documents.