Zabbix: The All-in-One Monitoring Giant You Either Love or Outgrow Slowly Zabbix is that one name that comes up in nearly every IT monitoring conversation. It’s open-source, feature-packed, ridiculously flexible — and also known for being slightly… well, unforgiving. But when it works, it works well.

It covers hosts, services, applications, networks, custom metrics, SNMP devices — all from a single central platform. You get graphing, alerting, templating, auto-discovery, dashboards, dependenc

Checkmk Raw Edition: Serious Monitoring Without a SaaS Bill There’s lightweight monitoring, and then there’s Checkmk — the kind of tool that says, “You want deep metrics? OK. Here’s everything.” And the Raw Edition gives you all of that without any licensing nonsense or cloud lock-in.

It’s based on Nagios under the hood — but don’t let that scare you. Checkmk adds a real web UI, automated discovery, performance graphs, smart service checks, and better scaling. It turns the old-school Nagios mod

SigNoz: OpenTelemetry-Based Observability Without Giving Up Control Most monitoring stacks either cost a fortune, or they flood you with complexity before you even get your first chart. SigNoz is different. It’s built on OpenTelemetry, doesn’t lock you into a cloud vendor, and gives you full-stack tracing, metrics, and logs — all in one dashboard you host yourself.

If you’ve been juggling Prometheus, Jaeger, Grafana, and Loki just to figure out why an endpoint is slow, SigNoz simplifies that in

Netdata: Real-Time Monitoring That Feels Instant (Because It Is) There’s monitoring, and then there’s Netdata. Most tools show you graphs with a five-minute lag. Netdata shows you what’s happening right now — with per-second granularity, insane levels of detail, and a dashboard that loads before you finish typing the URL.

You don’t need to build a stack. No Prometheus, no Grafana, no agents across five machines just to track CPU. Netdata is one binary, one port, zero friction. It starts showing