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nagiosgraph is an application to collect performance data from nagios plugins, insert the data into rrdtool database, and generate webpages with rrdtool graphs of the performance data. nagiosgraph is easy to configure, and ready to use for many nagios plugins.

Network Leak Finder is a collection of small perlscripts that detects connectivity between network segments. It is mostly useful to detect "leaks" in large organizations that have private network segments physically separated from the Internet.

NFDUMP tools support netflow v5, v7 and v9 capturing and processing. nfcapd - netflow capture daemon. Reads the netflow data from the network and stores the data into files. nfdump - netflow dump. Reads the netflow data from the files stored by nfcapd. It's syntax is similar to tcpdump. If you like tcpdump you will like nfdump. nfprofile - netflow profiler. Reads the netflow data from the files stored by nfcapd. Filters the netflow data according to the specified filter sets (profiles) and stores the filtered data into files for later use. nfreplay - netflow replay. Reads the netflow data from the files stored by nfcapd and sends it over the network to another host. ft2nfdump - flow-tools to nfdump - optional component.

NfSen is a graphical web based front end for the nfdump netflow tools. NfSen allows you to: * Display your netflow data: Flows, Packets and Bytes using RRD (Round Robin Database). * Easily navigate through the netflow data. * Process the netflow data within the specified time span. * Create history as well as continuous profiles. * Write your own plugins to process netflow data on a regular interval

VMPS (VLAN Management Policy Server) is a way of assigning switch ports to specific VLANs based on the MAC address of connecting device. OpenVMPS is a GPL implementation of VMPS.

Packit is a network auditing tool. Its value is derived from its ability to customize, inject, monitor, and manipulate IP traffic. By allowing you to define (spoof) nearly all TCP, UDP, ICMP, IP, ARP, RARP, and Ethernet header options, Packit can be useful in testing firewalls, intrusion detection systems, port scanning, simulating network traffic, and general TCP/IP auditing. Packit is also an excellent tool for learning TCP/IP.

PADS is a signature based detection engine used to passively detect network assets. It is designed to complement IDS technology by providing context to IDS alerts. Goals: * Passive: Records and identifies traffic seen on a network without actively "scanning" a system. There will never be a packet sent from the pads applications. * Portable: Has the ability to be placed easily on a remote system. Does not require additional external libraries other than those associated with libpcap. * Lightweight: Logging is sent to a simple CSV file. There is no need for a database or other data repository installed on the local machine. All correlation is done outside of the pads program.

phpipam is an open-source web IP address management application. Its goal is to provide light and simple IP address management application. It is ajax-based using jQuery libraries, php scripts, javascript and some HTML5/CSS3 features. - IPv4 / IPv6 address management - ICMP status updates, subnet scanning and status showing - Domain authentication (AD) / OpenLDAP authentication - Visual subnet display - VRF support - VLAN management - RIPE import - Import / export XLS files - E-Mail notification with IP details - IP database search - Custom IP/subnet/userVLAN address fields

pmacct is a set of network tools to gather IP traffic informations (bytes counter and number of packets); aggregation of statistics is done using simple primitives (MAC addresses, source host, destination host, ports and ip protocols) that can be used alone or combined together to form complex aggregation methods; counters are either global or historical (broken at fixed timeslots). Data is either stored in a memory table, pulled to stdout or in a SQL database (MySQL or PostgreSQL). Gathering packets off the wire is done either using pcap library (and promiscuous mode of the listening interface) or reading Netflow packets coming from the network.

IPplan is a free (GPL), web based, multilingual, IP address management and tracking tool written in php4, simplifying the administration of your IP address space. IPplan goes beyond IP address management including DNS administration, configuration file management, circuit management and storing of hardware information. IPplan can handle a single network or cater for multiple networks and customers with overlapping address space.