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Arpalert uses ARP protocol monitoring to prevent unauthorized connections on the local network. If an illegal connection is detected, a program or script is launched, which could be used to send an alert message, for example.

Cacti is a complete frontend to RRDTool, it stores all of the necessary information to create graphs and populate them with data in a MySQL database. The frontend is completely PHP driven. Along with being able to maintain Graphs, Data Sources, and Round Robin Archives in a database, cacti handles the data gathering. There is also SNMP support for those used to creating traffic graphs with MRTG.

NetXMS is new and rapidly developing monitoring system, released under GPL2 license. It can be used for monitoring entire IT infrastructure, starting with SNMP-capable hardware (like switches and routers) and ending with applications on your servers. NetXMS is an extremely reliable and powerful monitoring system, enabling you to improve your network availability and service levels.

Centreon Clib is a common library for all Centreon products written in C/C++. This project provides high level implementation of many basic system mechanism. The target is to have a portable and powerful implementation.

phpIP Management is a complete IPv4 IPAM (IP address management) suite, built to handle the complexity of managing today's IP address space. phpIP Management was built to scale and address the full lifecycle of IP address space using techniques that are not administratively intensive.

CoovaChilli is an access controller It provides a captive portal / walled garden environment. Coova builds on the popular features of the now defunct Chillispot.

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.

Device templates for use with devmon.

Docsis is a small program that can be used to generate binary configuration files for DOCSIS-compliant cable modems. DOCSIS stands for Data over Cable Service Interface Specification and is a standard developed by Cablelabs.

EtherApe is a graphical network monitor for Unix modeled after Etherman. Featuring link layer, IP and TCP modes, it displays network activity graphically. Hosts and links change in size with traffic. Color coded protocols display. It supports Ethernet, FDDI, Token Ring, ISDN, PPP, SLIP, and WLAN devices, plus several encapsulation formats. It can filter traffic to be shown, and can read packets from a file as well as live from the network. Node statistics can be exported.