Omnipeek Alternatives

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

AirGrab WiFi Radar is a WiFi scanning tool that is used for showing information about Apple AirPort based stations and other WiFi connections and access points.

AirDroid Business, an enterprise-grade MDM solution, is designed to enable businesses mobility and productivity through remote access and control, device provisioning, policy application and management, kiosk mode, and geofencing.

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Lizard Systems WiFi Scanner is a multi purpose WiFi scanner and WiFi troubleshooting tool designed for dealing with all WiFi related issues conveniently.

NetSurveyor is an all one network diagnosing and troubleshooting tool for the Windows operating systems.

inSSIDer Essential makes it easy to maintain small business WiFi.

tcpdump is a common packet analyzer that runs under the command line.

Open Source

Netmon is an all-in-one network monitoring solution for identifying and resolving IT infrastructure and network issues.

WiFi Explorer is a tool to scan, find, and troubleshoot wireless networks.

Fiddler is a debugging program for websites.

Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:

Open Source

Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.

SolarWinds' NetFlow Traffic Analyzer is a powerful tool for monitoring your network's bandwidth utilization.

Official source of information about Netstumbler.