Nagios

http://www.nagios.org/

About Nagios Home > About Get proactive. Save time, money, and your sanity. Nagios is the industry standard in enterprise-class monitoring for good reason. It allows you to gain insight into your network and fix problems before customers know they even exist. It's stable, scalable, supported, and extensible. Most importantly, it works. What does Nagios provide? Comprehensive Network Monitoring Windows Linux/Unix Routers, Switches, Firewalls Printers Services Applications Immediate Awareness and Insight Receive immediate notifications of problems via email, pager and cellphone Multi-user notification escalation capabilities See detailed status information through the Nagios web interface Problem Remediation Acknowledge problems through the web interface Automatically restart failed applications, services and hosts with event handlers Proactive Planning Schedule downtime for anticipated host, service, and network upgrades Capacity planning capabilites through usage monitoring Reporting Options SLA availability reports Alert and notification history reports Trending reports through integration with Cacti and RRD-based addons Multi-Tenant/Multi-User Capabilites Multiple users can access the web interface Each user can have their own unique, restricted view Integration With Your Existing Applications Trouble ticket systems Wikis Easily Extendable Architecture Over 200 community addons are available to enhance Nagios Stable, Reliable, and Respected Platform 10 years in development Scales to monitor 100,000+ nodes Failover protection capabilities Winner of multiple awards Constant media coverage Huge Community 250,000+ users worldwide Active mailing lists Extensive community website network Customizable Code Open Source Software Full access to source code Released under the GPL license