Moesif is an API analytics platform that helps developers design better developer experiences by providing product insights into how customers use their APIs and tooling.
Site24x7 is one of the oldest website monitoring services, having been in operation since 2006. They are now owned by Zoho. They provide website monitoring, server monitoring, and application monitoring. Clients include Groupon, Getty Images, Xerox, and Harley-Davidson.
ManageEngine is Zoho Corporation's enterprise IT management software subsidiary. They provide simple, easy-to-use IT management solutions at a cost that every company can afford.
SolarWinds Inc., based in the United States, is a software company that helps businesses manage their networks, systems, and IT infrastructure. Its headquarters are in Austin, Texas, and it has sales and product development offices around the United States and in a number of other countries.
Stackify Retrace is a simple SaaS application monitoring solution that integrates a number of essential features such as APM, logs, metrics, and more. It gathers a large quantity of information about the health and performance of your application.
New Relic and Atatus both ensure application performance through operational data monitoring, application monitoring, and infrastructure monitoring features. Since most companies offer those monitoring features, New Relic and Atatus are the best in the business.
If you want an APM that you can get all the features one would need in understanding performance monitoring of your apps. Read about all the NewRelic alternatives here.