Armory
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AsItHappens Network Statistic Collector
AsItHappens is a real-time network statistic collector and grapher. It collects data from devices over a network and displays them on a graph, optionally storing collected data in a database for later retrieval. Current collection types include network response, bandwidth, processor usage, memory usage, Cisco NBAR, Cisco NetFlow and arbitrary ...
BGPlay
BGPlay is a Java application which displays animated graphs of the routing activity of a certain prefix within a specified time interval. Its graphical nature makes it much easier to understand how BGP updates affect the routing of a specific prefix than by analyzing the updates themselves. The BGPlay database ...
Cacti 
(6 ratings)
Cacti is a complete network graphing solution designed to harness the power of RRDTool's data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. All of this is wrapped in an intuitive, easy to use ...
Curl
Powerful tool used by many data centers to check the L7 connectivity.. I saw this missing in your list.
driftnet
Inspired by EtherPEG, Driftnet is a program which listens to network traffic and picks out images from TCP streams it observes. Fun to run on a host which sees lots of web traffic.
EveryPing
EveryPing shows you: 1. Your IP address 2. Your host name 3. The round trip ICMP delay between the EveryPing server and your firewall 4. The RFC Jitter calculated from the ICMP delay 5. A chart with the most recent 10 delay results
Hyperic HQ
Hyperic HQ is open source web infrastructure management software. Hyperic HQ and its agent software can be installed on many platforms. Commercial support subscriptions are also available.
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. Handy for answering the question "why is our ADSL link so slow?".
IPCop
IPCop Firewall is a Linux firewall distribution geared towards home and SOHO (Small Office/Home Office) users. The IPCop interface is very user-friendly and task-based. IPCop offers the critical functionality of an expensive network appliance using stock, or even obsolete, hardware and OpenSource Software. IPCop lets you take an old PC ...
Kiwi CatTools 
(2 ratings)
Kiwi CatTools automates configuration backups and management on routers, switches and firewalls. It provides e-mail notification and compare reports highlighting config changes. Supports Telnet, SSH, TFTP and SNMP.
ManageEngine OpManager (2 ratings)
OpManager supports monitoring using Syslog, SNMP, SNMP Traps, Cisco IP SLA, NetFlow, sFlow, IP-FIX, NBAR, CBQoS, TFTP/ SCP (for Network Configuration Management), WMI, Event Log (for Windows Servers) and Telnet/ SSH (for UNIX platform devices). It is a commercial network monitoring and management software (a free version also exists for ...
MRTG
The Multi Router Traffic Grapher (MRTG) is a tool to monitor the traffic load on network links. MRTG generates HTML pages containing PNG images which provide a LIVE visual representation of this traffic.
mtr
mtr combines the functionality of the traceroute and ping programs in a single network diagnostic tool. As mtr starts, it investigates the network connection between the host mtr runs on and HOSTNAME by sending packets with purposefully low TTLs. It continues to send packets with low TTL, noting the response ...
Nagios (5 ratings)
Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. It has been designed to run under the Linux operating system, but works fine under most *NIX variants as well. The monitoring daemon runs intermittent checks on hosts and ...
Netdisco (1 rating)
Netdisco is an Open Source web-based network management tool first released publically in 2003. The target users are large corporate and university networks administrators. Data is collected into a Postgres database using SNMP and presented with a clean web interface using Mason. Configuration information and connection data for network devices ...
Nfdump
Nfdump is a set of tools to collect and process netflow data. It's fast and has a powerful filter pcap like syntax. Nfdump supports netflow versions v5, v7 and v9 as well as a limited set of sflow and is IPv6 compatible. See also [NfSen](http://nfsen.sourceforge.net/).
NfSen
NfSen is a graphical web based front end for the [nfdump](http://nfdump.sourceforge.net/) netflow tools.
Observium (1 rating)
Observium is an auto-discovering PHP/MySQL based network monitoring system focused primarily on Cisco and Linux networks but includes support for a wide range of network hardware and operating systems. Observium has grown out of a lack of easy to use NMSes. It is intended to provide a more navigable interface ...
Pandora FMS
Pandora FMS is a monitoring Open Source software. It watches your systems and applications, and allows you to know the status of any element of those systems. Pandora FMS could detect a network interface down, a defacement in your website, a memory leak in one of your server application, or ...
PRTG Network Monitor
PRTG Network Monitor (PRTG, successor of Paessler Router Traffic Grapher) is a network monitoring software from Paessler AG. PRTG runs on Windows and monitors network availability and network usage using SNMP, Packet Sniffing, WMI, IP SLAs and Netflow and various other protocols.
RANCID (2 ratings)
RANCID monitors a router's (or more generally a device's) configuration, including software and hardware (cards, serial numbers, etc) and uses CVS or Subversion to maintain history of changes. Rancid currently supports Cisco routers, Juniper routers, Catalyst switches, Foundry switches, Redback NASs, ADC EZT3 muxes, MRTd (and thus likely IRRd), Alteon ...
SecurityOnion
Security Onion is a Linux distro for IDS (Intrusion Detection) and NSM (Network Security Monitoring). It's based on Xubuntu 10.04 and contains Snort, Suricata, Sguil, Squert, argus, Xplico, tcpreplay, scapy, hping, and many other security tools.
SolarWinds Orion (5 ratings)
Orion is a commercial network management system produced by SolarWinds. It is capable of syslog, SNMP, NetFlow, and other types of monitoring. Additionally, it can be expanded with purchasable modules.
SolarWinds Real-time NetFlow Analyzer (1 rating)
Once you’ve turned on NetFlow, Real-time NetFlow Analyzer captures and analyzes this data in real time to show you exactly what types of traffic are on your network, where that traffic is coming from, and where it is going. Finally, you can take the guesswork out of diagnosing network traffic ...
TheDude
This is an awesome utility for doing SNMP tracking, network usage, the works! You can underlay geographical maps to use on you WAN maps or floorplans for LAN mapping. It can track just about anything under the sun that is network connected. Best of all, it's free!
Whoisup
WhoisUP monitors hosts via ICMP and shows the status in a web page. When a host is down, the script can send mail, syslog message, open a popup message or play a sound. The script uses NMap to send ICMP packets and to save the host status into an XML ...
WinMTR
A win32 with GUI version of mtr (http://www.bitwizard.nl/mtr/), not quite as full featured but handy as a free and stand-alone tool.
Zabbix (2 ratings)
Zabbix is a network management system created by Alexei Vladishev. It is designed to monitor and track the status of various network services, servers, and other network hardware. It uses MySQL, PostgreSQL, SQLite or Oracle to store data. Its backend is written in C and the web frontend is written ...
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