Nagios

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Complete monitoring and alerting for servers, switches, applications, and services

What is Nagios?

Nagios is a host/service/network monitoring program written in C and released under the GNU General Public License.
Nagios is a tool in the Monitoring Tools category of a tech stack.

Who is using it?

214 companies use Nagios in their tech stacks, including Uber, Dropbox, and Twitch.

Uber

Dropbox

Twitch

9GAG

Codecademy

Groupon.com

PedidosYa

New Relic

Vine

hike

Anaplan

Webedia

Why developers like Nagios

It just works
The standard
Customizable
The Most flexible monitoring system
Huge stack of free checks/plugins to choose from