Grafana
AGPL-3.0 dashboarding and observability platform: FedRAMP authorized and self-hostable, with unified metrics, logs, and traces. A sovereign alternative to Datadog at no per-host cost.
Observability
Category: Observability under Infrastructure & Cloud
Uptime Kuma
MIT-licensed, self-hosted uptime monitoring and status page tool: HTTP/S, TCP, DNS checks with 90+ notification channels; single-instance architecture with no RBAC or multi-region polling.
SigNoz
MIT-core application observability: unified APM, logs, and traces via OpenTelemetry, with no per-host or ingestion fees. SAML SSO and RBAC require the Enterprise Edition.