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?

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

Uber

Twitch

Dropbox

Hepsiburada

Zalando

doubleSlash

Fiverr

9GAG

Lumosity

Groupon.com

Dek-D

UNIQLO

Why developers like Nagios

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