Nagios has heritage in many ISPs. Often used with the ganglia graphing system.
OpenNMS is a scalable enterprise class network monitoring system. Integrates with service management Request Tracker.
Hyperic acquired by VMware also supports monitoring of virtualised infrastructure. In addition to server, application and performance management it has integration into VMWare’s vshpere products.
Zabbix is a mature monitoring framework with agents for many operating systems and software stacks.
ZenOSS is a leading network monitoring system, deployed to 35,000 customers across 35 countries.
Opsview, using the nagios core, can monitor a range of applications, operating systems and hardware. Functions include distributed monitoring, service desk integration, and reporting. Opsview Enterprise 3.10 won the 2011 Techworld One to Watch award.
Nagios provides monitoring for the Wikipedia infrastructure. Reference http://bit.ly/erRSEd
Zabbix is used by large organisations such as DEAC IT services across four continents, leading Polish telecoms Netia monitoring 20,000 parameters, NTT Comms, large Brazilian energy company PetroBras. Reference http://bit.ly/swdGQw
Sendmail has been powering email globally since the early 80s.
Postfix is a mail transport agent, originally developed by IBM, which for which complex configuration is relatively easier. For example, it supported virtual domains early and in a relatively manageable manner.
Developed at the University of Cambridge, Exim is an administrator and developer friendly MTA. It allows flexible builds and extensions, and greater number of mail policy controls.
Postfix users include the University of Malaga for approx 100,000 mailboxes, Connect.com.au (now AAPT) amongst Australia’;s largest network service providers, US Navy. Reference http://bit.ly/JI5d7l
Sendmail is the most popular MTA on the internet, and though it’s use is declining it still leads. Reference http://bit.ly/JBqNMS
Exim is popular within large ISPs and universities, handling thousands of mail accounts. Reference http://bit.ly/8ri5mx
Digicert, Entrust, GlobalSign, Thawte, Verisign.
OpenCA is open source software to implement a certificate authority. It is used by leading project ssuch as OpenLDAP, OpenSSH and Apache.
CACert is a community driven certificate authority which issues public key certificates free of charge. CAcert has over 200,000 verified users and has issued nearly 800,000 certificates as of January 2012.
Wireshark is the de facto protocol analyser. It has very comprehensive abaility to decode and present a wide range of protocols running over a network. For very large infrastructures wireshark may be paired with hatrdware optimised to capture large volumes of network traffic.
Wireshark is the de facto protocol analyser in the security and developer community.
Provides network services and applications based on open source core and software, including routing, VPN.
Commercial support available. Considered cheaper than incumbents
Similar interface to Juniper JUNOS and Cisco IOS, as well as graphical interface.
Customers include Toyota, CBS, CSC, EMC, Dell, Nokia, VMWare, Rackspace, FranceTelecom, US Homeland Security, US Justice Department. Reference http://bit.ly/gbFoTu
Cisco Unified Communications Manager
Asterisk is a mature software PBX, covering PSTN and VoIP services. Features include voicemail, conference calling, and automatic call distribution. Protocols supported include SIP, MGCP, H323. Asterisk is known to support commercial PBX products.
Customers of services based on Atserisk include US Army, Symbian Foundation, La Poste, University of Pennsylvania. Reference http://bit.ly/b8zhvN