1)   PRTG - Paessler Router Traffic Grapher 5.2.0.581
An easy to use Windows solution that monitors and classifies bandwidth and network usage. The software supports SNMP, packet sniffing and netflow to generate live readings and trend data to optimize the efficiency of your network components.
SNMP, packet sniffer, packet sniffing, netflow, cisco, router, firewall, mrtg, bandwidth, usage,

 2)   InJoy Dialer 3
InJoy offers unattended operation, robust [24/7] connections, Firewall protection, Internet Gateway, and powerful IPSec VPN capability. It's the perfect choice for dial-up based embedded systems, mobile workers and the home-network gateway.
injoy, multi-platform, cross-platform, intrusion detection, next generation firewall, dial-up, dial-in, ppp, oem firewall, personal firewall,

 3)   Paessler SNMP Tester 1.0
Test and debug SNMP requests with Paessler SNMP Tester for free. Run simple SNMP requests against a device in your network, testing each single step of the SNMP request as it is logged into a logfile for analysis.
SNMP, packet sniffer, packet sniffing, netflow, cisco, router, firewall, mrtg, bandwidth, usage,

 4)   Proxy Workbench 1.2
Proxy Workbench is a unique proxy server ideal for developers, trainers and security experts that displays its data in real-time.
Proxy Workbench, Proxy Server, Sockets, Socket, TCP, UDP Sockets, TCP Sockets, Packet Sniffing, Socket protocols, Packet Sniffer,

 5)   Socket Workbench 3.1
Socket Workbench is the definitive tool for analysing socket communications that underlie the Internet and several types of inter-process communication.
Sockets, Socket Workbench, UDP, Socket, TCP, UDP Sockets, TCP Sockets, Packet Sniffing, Socket protocols, Packet Sniffer,

 6)   Paessler Netflow Tester 1.0
Paessler Netflow Tester is a free program that simply dumps the data of all Netflow packets that a computer receives from a Cisco router. This can be useful when debugging bandwidth monitoring configurations based on Cisco's Netflow protocol.
SNMP, Cisco, netflow, packet sniffer, packet sniffing, netflow, cisco, router, firewall, mrtg,