Grafana Loki
Log aggregation inspired by Prometheus: index only labels, not full text. Cheap at scale.
Splunk
Graylog
Mature log management and search with streams, pipelines, dashboards, and alerting. A practical Splunk alternative for log-heavy teams.
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.
Parseable
Rust-based log lake that writes Parquet to S3-compatible object storage. Compute-storage separated, indexless by design.
Quickwit
Rust search engine for logs and traces with sub-second queries directly against S3-compatible object storage.
Zabbix
Classic agent-based monitoring suite for hosts, networks, and services. Pre-Prometheus old guard, still actively developed.