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@@ -158,11 +158,12 @@ A curated list of amazingly awesome open source sysadmin resources inspired by [
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* [Munin](http://munin-monitoring.org/) - Networked resource monitoring tool.
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* [Naemon](http://www.naemon.org/) - Network monitoring tool based on the Nagios 4 core with performance enhancements and new features.
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* [Nagios](http://www.nagios.org/) - Computer system, network and infrastructure monitoring software application.
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+* [Observium](http://www.observium.org/) - SNMP monitoring for servers and networking devices. Runs on linux.
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+* [Opsview](http://www.opsview.com/solutions/core) - Based on Nagios 4, Opsview Core is ideal for small IT and test environments.
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+* [Riemann](http://riemann.io/) - Flexible and fast events processor allowing complex events/metrics analysis.
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* [Sensu](http://sensuapp.org/) - Open source monitoring framework.
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* [Shinken](http://www.shinken-monitoring.org/) - Another monitoring framework.
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* [Thruk](http://www.thruk.org/) - Multibackend monitoring webinterface with support for Naemon, Nagios, Icinga and Shinken.
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-* [Observium](http://www.observium.org/) - SNMP monitoring for servers and networking devices. Runs on linux.
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-* [Opsview](http://www.opsview.com/solutions/core) - Based on Nagios 4, Opsview Core is ideal for small IT and test environments.
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* [Xymon](http://www.xymon.com/) - Network monitoring inspired by Big Brother.
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* [Zabbix](http://www.zabbix.com/) - Eenterprise-class software for monitoring of networks and applications
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* [Zenoss](http://community.zenoss.org) - Application, server, and network management platform based on Zope.
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@@ -211,8 +212,9 @@ Comparison of NoSQL servers: http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-v
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*SMTP servers.*
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* [Exim](http://www.exim.org/) - Message transfer agent (MTA) developed at the University of Cambridge.
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-* [Qmail](http://cr.yp.to/qmail.html) - Secure Sendmail replacement.
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+* [OpenSMTPD](https://opensmtpd.org/) - Secure SMTP server implementation from the OpenBSD project.
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* [Postfix](http://www.postfix.org/) - Fast, easy to administer, and secure Sendmail replacement.
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+* [Qmail](http://cr.yp.to/qmail.html) - Secure Sendmail replacement.
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* [Sendmail](http://www.sendmail.com/sm/open_source/) - Message transfer agent (MTA).
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## Software Containers.
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Francisco Augusto