Scapy

Scapy is a powerful interactive packet manipulation program.

17 Alternatives To Scapy

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Advanced IP Scanner

Advanced IP Scanner shows all network devices, gives you access to shared folders, and can even remotely switch computers off. Download it Free.
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Angry IP Scanner

Open-source and cross-platform network scanner designed to be fast and simple to use

Fiddler

Fiddler is a debugging program for websites.

Fing

Discover which devices are connected to any Wi-Fi network, map devices, detect intruders, assess…
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Ixchariot

Instant performance assessment of complex networks from pre- to post-deployment.

JPerf

This project gives a better UI and new functionalities to the initial JPerf 1.

MASSCAN

This is the fastest Internet port scanner.

Nipper

Nipper - Neat Internet Protocol Packet EditoR - is a graphical packet generation tool.

Nmap

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

Packet Editor a free packet editing tool to debug winsock based network solutions.

PsPing

PsPing is a command-line utility for measuring network performance.
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SmokePing

Smokeping is a tool for measuring latency.

Wireless Network Watcher

scans your wireless network and displays the list of all computers and devices that are currently connected to your network.
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Wireshark

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

Zenmap is the official cross-platform GUI for the Nmap Security Scanner.

iperf

A TCP, UDP, and SCTP network bandwidth measurement tool

netcat

Netcat is a featured networking utility which reads and writes data across network connections…