Nagios

The product is an open source IT infrastructure monitoring tool that detects issues with servers, networks, applications and services and sends alerts to prevent downtime and maintain performance. It is for IT teams, operations teams and developers in businesses of all sizes that need to oversee infrastructure health. It is delivered as a free community-driven open source engine with commercial extensions for visualization, automation, reporting and governance.

Key features

• Monitor servers
• Monitor networks and applications
• Monitor websites and services
• Monitor switches, routers and firewalls
• Monitor ports and metrics
• Proactive issue detection
• Instant alerts
• Cross-platform agent for Windows, Linux, Mac
• Real-time system metrics monitoring