Icinga is described as 'fork of Nagios and is backward compatible. So, Nagios configurations, plugins and addons can all be used with Icinga' and is an app in the Network & Admin category. There are more than 50 alternatives to Icinga for a variety of platforms, including Linux, Windows, Online / Web-based, Mac and Android. The best alternative is Zabbix, which is both free and Open Source. Other great apps like Icinga are Nagios (Freemium, Open Source), Spiceworks Help Desk (Free), Datadog (Paid) and LibreNMS (Free, Open Source).
Gather and analyze accurate statistics and performance metrics, visualize it, get notified about current and potential issues without delay, and take advantage of our time-tested professional development and support.
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. 120+ Integrations!.
Checkmk is a monitoring tool of servers, applications, networks, cloud, containers, storage, databases, IoT and more. Checkmk is available as Raw Edition, which is 100% pure open source, and as Enterprise Edition with a lot of additional features.
Observium is an autodiscovering PHP/MySQL/SNMP based network monitoring which includes support for a wide range of network hardware and operating systems including Cisco, Linux, FreeBSD, Juniper, Brocade, Foundry, HP and many more.