1. Wireshark is the world's foremost network protocol analyzer. It lets you capture and interactively browse the traffic running on a computer network. It is the de facto (and often de jure) standard across many industries and educational institutions.
  2. tcpdump is a common packet analyzer that runs under the command line. It allows the user to intercept and display TCP/IP and other packets being transmitted or received over a network to which the computer is attached.
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  3. Vistumbler is a wireless network scanner for Windows Vista and Windows 7.
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    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • Android
    • Android Tablet
    • Wine
    • FreeBSD
    • Docker
    The iperf series of tools perform active measurements to determine the maximum achievable bandwidth on IP networks. It supports tuning of various parameters related to timing, protocols, and buffers. For each test it reports the measured throughput, loss, and other parameters.
  4. eToolz includes some of the most important network tools like NS-Lookup, Ping, TraceRoute and Whois. It can check e-mail addresses and shows domain information entries.
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  5. NetworkMiner is a Network Forensic Analysis Tool (NFAT) for Windows. NetworkMiner can parse PCAP files and regenerate/reassemble transmitted files and certificates from PCAP files with HTTP, FTP, SMB, SMB2, TFTP and several other protocols.
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  6. Ettercap is a suite for man in the middle attacks on LAN. It features sniffing of live connections, content filtering on the fly and many other interesting tricks.
  7. Open Visual Traceroute download. Open Visual Traceroute 2016-06-19 00:43:20.467000 free download. Open Visual Traceroute Open source cross-platform Java Visual Networking tool
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  8. LinSSID is graphically and functionally similar to iwscanner (Linux) and Inssider (Microsoft™ Windows®). It is written entirely in C++ using Linux wireless tools and Qt4.
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  9. A 802.11 wireless scanner and connection manager for Mac OS X. WiFi Scanner will detect access points and clients in ad-hoc mode if the SSID is being broadcasted. It can be used for wireless site surveys, wireless discovery, and to connect to WiFi networks.
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  10. NetStumbler is a tool for Windows that allows you to detect Wireless Local Area Networks (WLANs) using 802.11b, 802.11a and 802.11g.

    Discontinued

    The program is no longer updated. Last version, 0.4.0, released in April 2004, can be still downloaded from the official website.

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    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    This project gives a better UI and new functionalities to the initial JPerf 1.0 project based on the iperf network bandwidth measurement tool.

    Discontinued

    The last update was released on May 5th, 2009.

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  11. Intercepter-NG is a multifunctional network toolkit for various types of IT specialists. The main purpose is to recover *interesting* data from the network stream and perform different kinds of MiTM attacks.

    Discontinued

    App unavailable on Play Store and website is flagged by modern browsers as potentially malicious.

    Warning

    Website blocked by modern browsers as possible trojan.

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  12. Radware (NASDAQ: RDWR), is a global leader of application delivery and cyber security solutions for virtual, cloud and software defined data centers.
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  13. speed.cloudflare.com is a tool that allows you to measure the speed and consistency of your connection to the Internet. You can use it to verify that the speed your ISP promised you is the speed you are getting.