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OpenNMS is an enterprise grade network monitoring and network management platform developed under the free software or open source model. It consists of a community-supported, free-software project as well as an organization offering commercial services, training and support.

Port Monitor is an easy and online tool that does website and server monitoring for you 24/7 every 60 seconds and sends you or your co-workers instant email/push notifications when something goes wrong.

Opsview is award winning unified service monitoring software for complex, distributed IT infrastructures.

Zenoss (Zenoss Core) is an open source application, server and network management platform based on the Zope application server. Released under the GNU General Public License (GPL) version 2, Zenoss Core provides a web interface that allows system administrators to monitor availability, inventory/configuration, performance and events.

Server and application performance monitoring has never been easier or more affordable. With agentless monitoring for hundreds of applications and hardware types, Server & Application Monitor delivers the management, alerting, and reporting you need to keep your servers and apps running at peak performance. Top 5 reasons to choose SolarWinds over SCOM: 1. Agentless monitoring provides quick comprehensive coverage and low overhead.2. Functional dashboards and common sense navigation are standard in SolarWinds SAM.3. Breadth of platform coverage, single pane of glass for server, application, network and storage health, extensible monitoring framework for custom applications.4. Affordable pricing. No professional services needed.5. Frequent functional updates. SolarWinds provides functional releases 2X per year »

Idera, formerly CopperEgg, is an all-in-one software-as-a-service designed and priced to ensure that organizations can effectively react to infrastructure performance issues. Idera provides four essential monitoring capabilities, giving you everything you need to identify and react to performance issues. These include server monitoring, website and web application monitoring, AWS monitoring, and database monitoring. Understanding the complex nature of today's IT infrastructures, we include out-of-the-box and fully customizable dashboards, alerts, and metric reports to match the requirements of your particular environment. »

Our open and flexible server and network monitoring solution delivers a unified view of your entire IT environment. Monitor up to 100,000 devices from a single server, with distributed and redundant solutions for nearly infinite scalability.

Nagwin is a Nagios implementation for Windows systems. It is a packaging of Nagios Core, Cygwin and many other related tools to make it a complete and ready-to-use solution for system monitoring. You can use Nagwin to monitor your IT-infrastructure Nagios-way from Windows.

Effortless monitoring for your online service