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SmartSniff

Free - NirSoft Freeware
SmartSniff allows you to capture TCP/IP packets that pass through your network adapter, and view the captured data as sequence of conversations between clients and servers. You can view the TCP/IP conversations in Ascii mode (for text-based protocols, like HTTP, SMTP, POP3 and FTP.) or as hex dump. (for non-text base protocols, like DNS)
sniffer, network sniffer, network, network monitor, packet sniffer, http packet sniffer, web sniffer, web monitor, capture, monitor, http sniffer, protocol analyzer
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Free Serial Port Monitor

Free - HHD Software
Free software serial port monitor, Com Rs232 sniffer with communication packet data analyzer. This monitoring utility can spy, capture, view, analyze, test com ports activity performing com port connection and traffic analysis with data acquisition and control. You can use this system as device interface testing tool, modem data transfer viewer and so on.
monitoring, password sniffer, netflow, decode http packets, tcp sniffer, cisco, bandwidth, ip sniffer, prtg, snmp, windows, traffic
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easy Look at Packets

Free - Look@Net.com
"easy Look at Packets" is a simple packets sniffer. Packets are filtered by incoming and outgoing, by IP addresses, ports and protocols - TCP, UDP, ICMP, IGMP. Programm does not demand installation and is very simple in management that is important for beginning managers of system. Besides there is no need in third-party libraries, such as WinCap, etc.
packet sniffing, packet, packets, ethernet, http analyzer, router, ethereal, tcp ip, winpcap, ports scanner, packets sniffer, winsock
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SniffPass

Free - NirSoft Freeware
SniffPass is small utility that listens to your network, capture the passwords that pass through your network adapter, and display them on the screen instantly. SniffPass can capture the passwords of the following Protocols: POP3, IMAP4, SMTP, FTP, and HTTP (basic authentication passwords).
You can use this utility to recover lost Web/FTP/Email passwords.
mrtg, firewall, graph, sockets, usage, volume, analyzer, http, serial, raw sockets, dump, view
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PRTG Network Monitor

Free - Paessler AG
An advanced, easy-to-use network monitoring solution. Features include: up/downtime monitoring, traffic and usage monitoring, analysis and reporting. SNMP, WMI, Packet Sniffing, and NetFlow data acquisition methods are supported. Users can monitor their networks using more than 30 sensor types. Alerts are sent as soon as a network outage occurs. PRTG Network Monitor is available in both Freeware and Commercial editions.
analysis, system, pop3, passwords, activity, viewer, data, connection, testing, modem, imap4, smtp
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Wake-on-LAN Packet Sniffer

Free - Simplyware
Wake-on-LAN Packet sniffer is designed to troubleshoot and setup Wake-on-LAN entire your Network. It allows to check whether the target machine recieve the packet. Program will display all incoming "Magic Packets".
transfer, device, rs232, reader, test, port, ports, analyze, communication, security, network monitoring, 2000
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