Zabbix is an enterprise-class open source distributed monitoring solution.
Zabbix 1.8: The Ultimate Open Source Monitoring Solution
"Zabbix offers advanced monitoring, alerting and visualization features today which are missing in other monitoring systems, even some of the best commercial ones."
Distributed monitoring
Centralized configuration
Centralized access to all data
Up-to 1000 of Zabbix nodes
Unlimited number of proxies
Scalability
Tested with 100,000 monitored devices and servers
Tested with 1,000,000 availability and performance checks
Processing of thousands of availability and performance checks per second
Real-time monitoring
Performance monitoring
Availability monitoring
Integrity monitoring
Flexible notification conditions
Alerting users (Email, SMS, Jabber)
Logging
Visualization
User-defined views and slide shows
Mapping
Graphing (including pie charts)
Zooming
Fast Problem Resolution
Send alerts via email, cell phone, SMS or audio alerts
Execute remote commands
Read more: Zabbix
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