Zabbix
100 · HealthyEnterprise monitoring for networks, servers, VMs and applications, with templates, triggers and escalations.
Error tracking, uptime checks and application observability. Ranked by health score.
Enterprise monitoring for networks, servers, VMs and applications, with templates, triggers and escalations.
Metrics collection and time series database with its own query language (PromQL) and alerting rules.
Observability platform for logs, metrics, traces and real user monitoring, built for low storage costs.
OpenTelemetry-native observability with logs, metrics and traces in one app.
Alert management that pulls in alerts from your monitoring tools, deduplicates and correlates them, and runs workflows.
Observability on ClickHouse that links session replays, logs, metrics, traces and errors in one search.
Dashboards and alerting over metrics, logs and traces from Prometheus, Loki, SQL databases and many other sources.
Log aggregation that indexes labels rather than full text to keep storage cheap, queried from Grafana.
Status pages and uptime monitoring from several regions, with incident updates and alerting.
Health checks for HTTP, TCP, DNS and more, configured in YAML, with alerts and a status page.
Per-second infrastructure monitoring agent with auto-discovered metrics, dashboards and anomaly detection.
Uptime monitor for HTTP, TCP, DNS and more, with status pages and many notification channels.
Application performance monitoring with distributed tracing, service maps and metrics for microservices.
All-in-one platform for uptime checks, status pages, on-call, incidents, logs and APM.
Uptime, response time and server hardware monitoring, with incidents and status pages.
Cron job and background task monitoring that alerts you when expected pings stop arriving.
Status page with built-in monitors, incident history and a polished public page.
Log management with search, alerts and dashboards, designed to be light to run and privacy-friendly.
eBPF-based observability that collects metrics, logs, traces and profiles without code changes and suggests root causes.
OpenTelemetry APM for traces, metrics and logs, stored in ClickHouse.
The code for these is public, but the license is not an OSI open source license, or we have not verified it yet. Check the license notes on each project before relying on it.
Error tracking and performance monitoring; the same code as Sentry's hosted service.
Error tracking that accepts events from Sentry SDKs and runs on a single small server.
Status page system for publishing component status, incidents and scheduled maintenance.






Health and license are separate verdicts: a project can be well maintained and still not be open source.
| Project | Health | License | Stars |
|---|---|---|---|
| Zabbix | 100 · Healthy | Free, share hosted changesAGPL-3.0Relicensed 2024 | 6.5k |
| Prometheus | 97 · Healthy | Free to useApache-2.0 | 66k |
| OpenObserve | 94 · Healthy | Free, share hosted changesAGPL-3.0Relicensed 2023 | 22k |
| SigNoz | 92 · Healthy | Free core, paid extrasMIT | 32k |
| Keep | 92 · Healthy | Free core, paid extrasMIT | 12k |
| HyperDX | 91 · Healthy | Free to useMIT | 9.9k |
| Grafana | 90 · Healthy | Free, share hosted changesAGPL-3.0Relicensed 2021 | 77k |
| Loki | 90 · Healthy | Free, share hosted changesAGPL-3.0Relicensed 2021 | 29k |
| openstatus | 88 · Healthy | Free, share hosted changesAGPL-3.0 | 9.2k |
| Gatus | 87 · Healthy | Free to useApache-2.0 | 12k |
| Netdata | 86 · Healthy | Free core, paid extrasGPL-3.0 | 81k |
| Uptime Kuma | 83 · Healthy | Free to useMIT | 92k |
| Apache SkyWalking | 78 · Stable | Free to useApache-2.0 | 25k |
| OneUptime | 72 · Stable | Free core, paid extrasApache-2.0 | 7.7k |
| Checkmate | 70 · Stable | Free, share hosted changesAGPL-3.0 | 11k |
| Healthchecks | 69 · Stable | Free to useBSD-3-Clause | 10k |
| Kener | 69 · Stable | Free to useMIT | 5.2k |
| LogTide | 66 · Stable | Free, share hosted changesAGPL-3.0 | 457 |
| Coroot | 65 · Stable | Free to useApache-2.0 | 8.0k |
| Uptrace | 65 · Stable | Free, share hosted changesAGPL-3.0 | 4.3k |
| Sentry (self-hosted) | 99 · Healthy | Free, no resellingFunctional Source License 1.1Relicensed 2023 | 46k |
| Bugsink | 64 · Stable | Free, no resellingPolyForm Shield 1.0.0 | 2.1k |
| Cachet | 60 · Stable | Free with conditionsCachet License | 15k |
Alternatives to AxiomAlternatives to Better StackAlternatives to BugsnagAlternatives to ChecklyAlternatives to CoralogixAlternatives to CronitorAlternatives to DatadogAlternatives to DynatraceAlternatives to FireHydrantAlternatives to HoneycombAlternatives to incident.ioAlternatives to InstatusAlternatives to Logz.ioAlternatives to New RelicAlternatives to Oh DearAlternatives to PagerDutyAlternatives to PingdomAlternatives to PulseticAlternatives to RaygunAlternatives to RollbarAlternatives to RootlyAlternatives to Site24x7Alternatives to SplunkAlternatives to StatuspageAlternatives to Sumo LogicAlternatives to UptimeRobot
Scores last refreshed from GitHub on 9 October 2026. How we score.