Wireshark

Wireshark is the world's foremost network protocol analyzer. It lets you capture and interactively browse the traffic running on a computer network.

Free Open Source Mac OS X Windows Linux BSD

NetworkMiner

NetworkMiner is a Network Forensic Analysis Tool (NFAT) for Windows. NetworkMiner can be used as a passive network sniffer/packet capturing tool in order to detect operating systems, sessions, hostnames, open ports etc.

Freemium Windows

iftop

iftop does for network usage what top(1) does for CPU usage. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts.

Free Open Source Linux

SmartSniff

SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers. You can view the TCP/IP...

Free Windows

nload

nload is a console application which monitors network traffic and bandwidth usage in real time.

Free Open Source Linux BSD Solaris

trafficWatcher

trafficWatcher is a small tool to monitor your network activity. Unlike other tools, trafficWatcher can differentiate between traffic inside your LAN and the traffic that reaches the internet.

Free Open Source Windows

Bandwidth Manager

SoftPerfect Bandwidth Manager is a full-featured traffic management tool for Windows that offers cost-effective bandwidth control and quality of service based on built-in prioritized rules.

Commercial Windows

NetPeeker

Monitor network applications, personal firewall, trace whois, network speed limiter. NetPeeker is a network tool set that combines the functionality of traffic monitoring with the blocking features of a personal firewall.

Commercial Windows

LANGuardian

LANGuardian is the first and only deep packet inspection (DPI) software to provide SMB network managers with root cause information about network and user activity....

Commercial Mac OS X Windows Linux

Pirni Pro

Pirni Pro is a network security tool designed for iOS, and specifically for iPhone and iPod Touch devices. It is capable of intercepting traffic on a wireless network...

Commercial iPhone

Throttled Pro

Throttled Pro optimizes your internet connection and provides QoS (Quality of Service) to Mac OS X. It provides both ACK packet prioritization and PRIQ priority...

Commercial Mac OS X

AirSnare

AirSnare is another tool to add to your Wireless Intrusion Detection Toolbox. AirSnare will alert you to unfriendly MAC addresses on your network and will also alert...

Free Windows