Apache SkyWalking
Apache APM platform for service topology, distributed tracing, metrics, logs, and cloud-native diagnostics.
Logs
Fluent Bit
CNCF graduated lightweight log/metric forwarder. The default in-cluster log shipper for Kubernetes.
GoAccess
Fast terminal and HTML dashboard for analyzing web server access logs in real time.
Grafana
The de-facto open-source dashboard layer. Plug into Prometheus, Loki, Tempo, InfluxDB — one pane of glass.
Grafana Loki
Log aggregation inspired by Prometheus: index only labels, not full text. Cheap at scale.
Graylog
Mature log management and search with streams, pipelines, dashboards, and alerting. A practical Splunk alternative for log-heavy teams.
HyperDX
Open-source Datadog alternative that correlates logs, metrics, traces, and session replays in one UI.
OpenObserve
Rust-based, columnar, object-storage-backed. Claims 140x lower storage cost than Elasticsearch for logs.
OpenSearch Dashboards
Apache-2.0 fork of Kibana, paired with OpenSearch. The de-facto self-hosted alternative to Elastic for logs visualization.
OpenTelemetry Collector
Vendor-neutral telemetry collector for receiving, processing, and exporting traces, metrics, and logs.
Parseable
Rust-based log lake that writes Parquet to S3-compatible object storage. Compute-storage separated, indexless by design.
Perses
CNCF dashboarding tool with dashboards-as-code, static validation, and Kubernetes-native workflows. A GitOps-friendly Grafana alternative.
Quickwit
Rust search engine for logs and traces with sub-second queries directly against S3-compatible object storage.
SigNoz
Full-stack, OpenTelemetry-native APM + logs + metrics. The closest single-tool Datadog alternative.
Uptrace
OpenTelemetry APM backed by ClickHouse. Lean alternative to SigNoz.
Vector
High-performance observability data pipeline. Sources, transforms, sinks — written in Rust by Datadog (open source).