DeferPanic!

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.

Icinga is a fork of Nagios and is backward compatible. So, Nagios configurations, plugins and addons can all be used with Icinga. Though Icinga retains all the existing features of its predecessor, it builds on them to add many long awaited patches and features requested by the user community. Icinga is an enterprise grade open source monitoring system which keeps watch over a network and any conceivable network resource, notifies the user of errors and recoveries, and generates performance data for reporting. Scalable and extensible, Icinga can monitor complex, large environments across dispersed locations. Icinga is licensed under GPL V2. »

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.

Librato is a cloud-based monitoring platform for devops, development and operations teams who want the flexibility to monitor the metrics and events important to their application deployment, while leaving storage, analysis and alerting to a service that can scale with their operation.

SessionStack helps you see your web app defects through a user’s eyes.

App Enlight- provides a helpful interface to let you and your team save time spent on debugging and reproducing errors and performance problems from a production environment.

Amazon CloudWatch offers cloud monitoring services for customers of AWS resources. Collect & track metrics & react immediately to keep your businesses running smoothly.

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.

Software companies are adopting fast-moving development methods like continuous integration and continuous deployment, but QA testing has remained the weak point for many teams who want to move fast. Fortunately, you don’t have to settle for slow moving manual testing techniques or brittle automation to move fast and build great software. Rainforest QA is a continuous QA platform that leverages qualified testers to help companies create continuous QA testing processes that fit their CI/CD development workflow. With Rainforest QA, teams run functional and regression tests in plain English, and receive results in under 30 minutes. Anything you can do in a browser, Rainforest QA can test. On-demand around the clock, Rainforest is available 24/7 for testing when you're ready, not when your QA team is free. Rainforest is powered by qualified human testers, which means it remains flexible enough that you won't have to rewrite tests every time you change your code. »

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.