Free Axence NetTools is a comprehensive set of host monitoring, network scanning, security &

administration tools - all with a highly intuitive user interface:
Port scanner for all open ports and running services. It can discover some Trojans/spyware.

Network scanner discovers all nodes in a remote network, their IP/MAC and services running on them.

NetStat displays your computer's inbound and outbound connections, lists all open TCP/UDP ports, with the remote IP address & the process using the connection.TCP/IP workshop - establishes low-level TCP/UDP connections to troubleshoot and test network services. It can send raw data to any remote port.Other tools: fast traceroute shows information about every host on the route, its response time, and packets lost (full trace within 1 second). Lookup is like nslookup, but it shows you all DNS and WHOIS records at once. Bandwidth tool will measure network performance. NetCheck - with this tool you can check the quality of network hardware in your LAN.

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