Ganglia!

An uncompromising mature enterprise-level platform designed for real-time monitoring of millions of metrics collected from tens of thousands of servers, virtual machines and network devices, effortlessly scaling to even larger environments.

Datadog is a monitoring service for IT, Dev & Ops teams who write and run applications at scale, and want to turn the massive amounts of data produced by their apps, tools and services into a unified view of IT infrastructure. Datadog's capabilities are provided on a SaaS-based data analytics platform that enables multiple teams to work collaboratively on infrastructure issues.

Munin is a networked resource monitoring tool that can help analyze resource trends and "what just happened to kill our performance?" problems. It is designed to be very plug and play. A default installation provides a lot of graphs with almost no work.

netdata is a system for distributed real-time performance and health monitoring. It provides unparalleled insights, in real-time, of everything happening on the system it runs (including applications such as web and database servers), using modern interactive web dashboards.

Axibase Time-Series Database (ATSD) is a next-generation statistics database. ATSD is for companies that need to extract value from large amounts of time-series data which exists in their IT and operational infrastructure. Built on top of Hadoop Distributed File System (HDFS), ATSD delivers scalability and performance beyond relational database limitations.

IT monitoring has never been easier - lean back and let CloudRadar keep an eye on your servers, services and hosts. Up and running in minutes. No back doors.

Sentinet3 is an enterprise class unified proactive monitoring device able to monitor Systems, Applications, and Networks.

Cloud Decision Engine's purpose is to help your making your way through the jungle of Cloud Computing services and offers.

LogicMonitor provides hosted monitoring for the entire technology stack — storage, servers, networks, applications, virtualization , and cloud — in a single, unified solution. LogicMonitor includes built-in monitoring, alerting, and graphing for all devices found in the data center. LogicMonitor is changing the way IT infrastructure is monitored with its cloud-based, highly automated and easy to deploy solution.

Monique.io saves 90%+ of the time needed to set up custom dashboards when using traditional systems. Multiple input formats are being parsed automatically by AI and can be visualized on a dashboard by clicking the wanted values.

Open-source monitoring platform built by the team behind Stacktile and using Ansible to create a monitoring infrastructure.