Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. It is based on a hierarchical design targeted at federations of clusters. It leverages widely used technologies such as XML for data representation, XDR for compact, portable data transport, and RRDtool for data storage and visualization. 
 
 It has been used to link clusters across university campuses and around the world and can scale to handle clusters with 2000 nodes. It relies on a multicast-based listen/announce protocol to monitor state within clusters. The ganglia system comprises two unique daemons, a PHP-based web front-end. 
 
 Demo:
 <UL>
	<LI><A HREF="http://monitor.millennium.berkeley.edu/" target="_blank">http://monitor.millennium.berkeley.edu/</A>. Monitoring of University of California Berkeley Grid.</LI>
	<LI><A HREF="http://ganglia.wikimedia.org/" target="_blank">http://ganglia.wikimedia.org/</A> Monitoring of Wikimedia grid</LI>
 </UL>
 Sourceforge location: <A HREF="http://sourceforge.net/projects/ganglia/" target="_blank">http://sourceforge.net/projects/ganglia/</A>

Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. It is based on a hierarchical design targeted at federations of clusters. It leverages widely used technologies such as XML for data representation, XDR for compact, portable data transport, and RRDtool for data storage and visualization.

Ganglia - scalable distributed monitoring system

The Hidden Markov Model Toolkit (HTK) is a portable toolkit for building and manipulating hidden Markov models. HTK is primarily used for speech recognition research although it has been used for numerous other applications including research into speech synthesis, character recognition and DNA sequencing. HTK is in use at hundreds of sites worldwide.
 
HTK consists of a set of library modules and tools available in C source form. The tools provide sophisticated facilities for speech analysis, HMM training, testing and results analysis. The software supports HMMs using both continuous density mixture Gaussians and discrete distributions and can be used to build complex HMM systems. The HTK release contains extensive documentation and examples.

The Hidden Markov Model Toolkit (HTK) is a portable toolkit for building and manipulating hidden Markov models. HTK is primarily used for speech recognition research although it has been used for numerous other applications including research into speech synthesis, character recognition and DNA sequencing. HTK is in use at hundreds of sites worldwide.

HTK - Speech Recognition Toolkit

Nagios monitors your entire IT infrastructure to ensure systems, applications, services, and business processes are functioning properly. It provides centralized view of entire monitored IT infrastructure. In the event of a failure, Nagios can alert technical staff of the problem, allowing them to begin remediation processes before outages affect business processes, end-users or customers. 

 Nagios could be extended via Plugins. It is possible to monitor any probes (temperature, alarms...), which is capable of sending data to specific plugin. It has web and mobile interface for viewing current network status, notifications, problem history, log files, etc. 
 
 <A HREF="http://nagiosplugins.org/" target="_blank">http://nagiosplugins.org/</A> lists all available plugins.

Nagios monitors your entire IT infrastructure to ensure systems, applications, services, and business processes are functioning properly. It provides centralized view of entire monitored IT infrastructure. In the event of a failure, Nagios can alert technical staff of the problem, allowing them to begin remediation processes before outages affect business processes, end-users or customers.

Nagios - monitors your entire IT infrastructure

BusyBox combines tiny versions of many common UNIX utilities into a single small executable. It provides replacements for most of the utilities you usually find in GNU fileutils, shellutils, etc. The utilities in BusyBox generally have fewer options than their full-featured GNU cousins; however, the options that are included provide the expected functionality and behave very much like their GNU counterparts. BusyBox provides a fairly complete environment for any small or embedded system.

BusyBox - The Swiss Army Knife of Embedded Linux

Zabbix is an enterprise-class open source distributed monitoring solution. It is highly scaleable, capable of monitoring more than 100,000 devices and servers. A Zabbix agent can also be installed on UNIX and Windows hosts to monitor statistics such as CPU load, network utilization, disk space, etc. It also supports agentless monitoring via SNMP, TCP and ICMP. It monitors performance in real time and alers users via mail, SMS, Jabber (XMPP) clients. It supports variety of database including Oracle, MySQL, PostgreSQL, SQLite. Web based interface to visualize the data and generate reports and stats.

Zabbix is an enterprise-class open source distributed monitoring solution. It is highly scaleable, capable of monitoring more than 100,000 devices and servers. A Zabbix agent can also be installed on UNIX and Windows hosts to monitor statistics such as CPU load, network utilization, disk space, etc. It also supports agentless monitoring via SNMP, TCP and ICMP.

Zabbix - distributed monitoring solution

collectd is a daemon which collects system performance statistics periodically and provides mechanisms to store the values in a RRD files. It comes with more than 90 <A HREF="http://collectd.org/wiki/index.php/Table_of_Plugins" target="_blank">Plug-ins</A>, which helps to process, store and present the data in the way we want. 

 collectd utilizes a data push model. The data is collected and sent (pushed) to a multicast group or server. Thus there is no central instance which queries any values. collectd is able to handle any number of hosts, from one to several hundred.

collectd is a daemon which collects system performance statistics periodically and provides mechanisms to store the values in a RRD files. It comes with more than 90 Plug-ins, which helps to process, store and present the data in the way we want.

collectd – The system statistics collection daemon

Pandora FMS is a performance and availability monitoring system, ready for big environments. It uses agents for local monitoring and can do several kinds of remote network monitoring. It watches your systems and applications, and allows you to know the status of any element of those systems. It supports WMI, Agent and Network monitoring. It provides support to track GIS and viewing. Pandora FMS can also monitor any kind of TCP/IP service, without the need to install agents, and monitor network systems such as load balancers, routers, switches, operating systems, applications, or simply printers if you need. Pandora FMS also supports SNMP for collecting data and for receiving trap.

 <img src="/AppImages/Article/pandora-img1.png" alt="" class="float-center">

Pandora FMS is a performance and availability monitoring system, ready for big environments. It uses agents for local monitoring and can do several kinds of remote network monitoring. It watches your systems and applications, and allows you to know the status of any element of those systems.

Pandora FMS - Flexible Monitoring System

Icinga is an enterprise grade open source monitoring system which keeps watch over networks and any conceivable network resource, notifies the user of errors and recoveries and generates performance data for reporting. Icinga is a fork of Nagios and is backward compatible. So, Nagios configurations, plugins and addons can all be used with Icinga. Icinga sends notifications via email, SMS, Twitter, instant messaging. It has more features than Nagios. It is distributed and scalable. Sourceforge location: <A HREF="http://sourceforge.net/projects/icinga/" target="_blank">http://sourceforge.net/projects/icinga/</A>

Icinga is an enterprise grade open source monitoring system which keeps watch over networks and any conceivable network resource, notifies the user of errors and recoveries and generates performance data for reporting. Icinga is a fork of Nagios and is backward compatible. So, Nagios configurations, plugins and addons can all be used with Icinga. Icinga sends notifications  via email, SMS, Twitter, instant messaging. It has more features than Nagios. It is distributed and scalable.

Icinga - Monitoring system, A Nagios fork

Naemon is the new monitoring suite that aims to be fast, stable and innovative while giving you a clear view of the state of your network and applications. The Naemon core is a network monitoring tool based on the Nagios 4 core, but with many bug fixes, new features, and performance enhancements. If you today use Nagios, you should switch to Naemon to get bugfixes, new features, and performance enhancements.

Naemon - Networks, Applications and Event Monitor, a Nagios fork

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