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arts++ is a support package for CAIDA's cflowd and skitter. It provides a C++ class library and simple applications for handling data produced by cflowd and skitter. See: http://www.caida.org/tools/measurement/cflowd/ http://www.caida.org/tools/measurement/skitter/

cidr is a tiny command-line tool for determining network and broadcast addresses a la RFC 1878. It takes an IP address and netmask and outputs the network address, broadcast address, and total number of addresses for the corresponding subnet. The IP can be in binary, decimal, hex, or dotted quad. The mask can be in binary, decimal, hex, dotted quad, or prefix.

clog is a program that logs all connections on your subnet. It uses the pcap(3) packet capture library to log any SYN packets to a logfile. The output format is designed to be very easily parsed by various text processing tools.

This is a Java applet and application that can encode and decode a Cisco router's configuration register. It also shows some valuable notes for each router family that can help with disaster recovery. It is being released as part of the Cisco-centric Open Source Initiative.

Cricket is a high performance, extremely flexible system for monitoring trends in time-series data. Cricket was expressly developed to help network managers visualize and understand the traffic on their networks, but it can be used all kinds of other jobs, as well. It's similar to mrtg, but has a different approach.

RackMonkey is a web-based tool for managing racks of equipment such as web servers, video encoders, routers and storage devices. Using a simple interface you can keep track of what's where, which OS it runs, when it was purchased, who it belongs and what it's used for.

Fetchconfig is a Perl script for retrieving configurations of various network devices. It currently supports a variety of devices, such as: * 3Com MSR * Cisco IOS * Cisco ASA * Cisco Catalyst * FortiGate * MikroTik * ProCurve * Parks * Alcatel Ethernet Routers (Riverstone) * Dell PowerConnect switches * Old Terayon 3200/3500 CMTS

ipv6mon is a tool meant for monitoring IPv6 address usage on a local network. It is meant to be particularly useful in networks that employ IPv6 Stateless Address Auto-Configuration (as opposed to DHCPv6), where address assignment is decentralized and there is no central server that records which IPv6 addresses have been assigned to which nodes during which period of time.

NDPMon is an equivalent of ArpWatch for IPv6. NDPMon, Neighbor Discovery Protocol Monitor, is a tool working with ICMPv6 packets. NDPMon observes the local network to see if nodes using neighbor discovery messages behave properly. When it detects a suspicious Neighbor Discovery message, it notifies the administrator by writing in the syslog and in some cases by sending an email report.

check_certexp is a Nagios plugin for checking the number of days left until a certificate expires. The check is done via an SSL connection (STARTTLS mechanisms are not supported). The plugin is written in Perl, should work with the embedded Perl interpreter (not tested though) and requires Net::SSLeay and Date::Manip to be installed on the Nagios host.