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Raygun is an application monitoring and performance insight tool that helps you and your team to proactively find, diagnose and fix software errors and performance problems. Raygun is trusted by thousands of innovative organizations that use the tool to ship better experiences to their customers.

Over 1 million developers across 60,000 organization use Sentry to diagnose, fix, and optimize the performance of their code. Sentry is a commerical application monitoring platform that allow them to ship better software faster. 

Airbrake is a web-based error monitoring and performance insight tool for you entire application stack. With Airbreak, developers and teams can fearlessly push their deployments to production, faster. Airbrake notifiers are available for every major programming language and framework and install in minutes. Which allow you to spend less time tracking down bugs and more time to develop an application that your customers will enjoy.

New Relic is a commercial application and website monitoring tool. If server performance matter to you, then New Relic can help you find bottle necks in your application.

Datadog is a SaaS-based monitoring service for cloud-scale applications, providing monitoring of servers, databases, tools, and services, through a unique data analytics interface. With Datadog dog you can spot problems in your applications faster, and move quickly to fix it.

Sqreen is an application security management platform that is changing the way that development, security and operation teams protect, observe and and test their applications. With Sqreen it's easy to get started, to deploy screen you only need to add a library to your applications. The platform supports a vide variety of languages and runtimes including Node.js, Go, Java, Python, PHP, Ruby and .NET.