Zabbix (http://www.zabbix.com) - is a complete enterprise-level solution designed to monitor the components of the IT infrastructure.
Zabbix is an open-source software and is provided free of charge.
Collection of information through agents (Zabbix-agent; SNMP v1, 2c, 3, Trap PDU; IPMI;), without agents, or by any user-defined demands;
Monitoring of virtual machines, web scripts, Java applications, databases, etc. with the possibility of expanding this list by the user;
Support for internal processing and accumulation of monitoring data, as well as monitoring the performance of these operations;
Incident management;
Visualization of monitoring data via the web interface, incl. customizable panels, plans, and object maps, graphs based on data and metrics, information screens with the ability to rotate in time (slideshow), and display of events and notifications;
Notifications (e-mail, SMS, Jabber, users) with macros support, automatic execution of commands on monitoring objects, as well as a flexible system for acknowledging and escalating incidents;
Flexible authentication and authorization;
Typical settings templates and flexible import/export of configuration for nodes, maps, and screens;
Automatic detection scenarios;
Distributed monitoring with the possibility of grouping and hierarchical control;
Custom maintenance periods support, inventory, and hardware control scripts at the facility;
API for interacting with third-party applications;
