TCPEye Alternatives

TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...

CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer.

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SpeedGuide.net - The Broadband Guide. Cable modems, DSL, Wireless, Network security. Free speed tweaks and TCP/IP tools for optimizing system performance.

At whatever point you open a site association through your program or download documents, you are opening TCP/UDP connions.

TcpView For Linux. Touch screen friendly design graphical network connections viewer for Linux.

Technitium MAC Address Changer (TMAC) is a freeware utility to instantly change or spoof MAC Address of any network card (NIC).

Graphical network connections viewer for linux

Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.

Open Source

An advanced network monitoring solution to monitor network up/downtime, traffic and usage.

Network diagnostic and troubleshooting tool organizer with GRAPHICAL network map:

PortsMonitor is a system utility for monitoring system TCP/IP network connections by application...

This Remote Process Viewer shows suspicious processes running on Windows network clients.

Official source of information about Netstumbler.