I've been looking at this solution in comparison to Pandora.

HPE Operations Manager.

I evaluated Zenoss, Zabbix, SolarWinds, and other solutions.

It is hard not to consider other solutions now because of the advice of other CIOs and their experience with open source products that save them a lot of money. It may not always save time because they can be more difficult to use. That can be a trade-off.

I am in the process of testing a large number of solutions, and this is the best one.

We are testing out this solution in addition to Zabbix.

Solarwinds

CACTI

PRTG

I am familiar with other pricey pay-for network monitoring solutions. The Nagios Core solution is an open source and free product and allows customers to get their feet wet without doling out tens, if not hundreds, of thousands of dollars for a product they may not like. The pay-for solutions provide ample customer support, but if one is willing to pull up a chair and learn the Nagios solution from the ground up, it is well worth the time, versus extensive dollars, investment. And Nagios is highly customizable by the end-user.

There are several alternative to Nagios like Icinga (which is a 2.0 Nagios son), Observium, and LibreNMS. If you need only an SNMP monitoring system or you need real time graph Observium is your choice but Nagios is a complete solution.

Currently I use New Relic and Munin to track and maintain the operation I run. New Relic however isn't designed to alert like Nagios and they have told me as such.

We also compared the product to Zabbix.

Before choosing this product, I did not evaluate other options.

Nope, but I know the other monitoring tools which are paid as well as the open source. I like Nagios in comparison to them.

We evaluated ManageEngine, Solar Winds, Idera and Check_MK.

Although we did look at other tools, we felt Nagios was a good fit for us.

No other options were evaluated.

Before going to Nagios XI (commercial, meaning with support), because of the relationship my company had with Microsoft, I evaluated also SCOM. As with Nagios, I went through the whole installation and configuration process. Because of my previous knowledge, I directly compared it with Nagios, and the latter won, hands down.

When I was researching solutions I read about Nagios XI, and it was rated as one of the best solutions. I tried it and I liked it, which is why it was selected.

As they have their own official support, we decided to choose this product over the others we looked at.

I have tested Zenoss, ManageEngine solutions - Op Manager and Application Manager. We chose Nagios over Zenoss mainly because of its lightweight interface compared to Zenoss and the ManageEngine free edition has limited nodes.