Apache Kafka
Apache Software Foundation · Messaging & queues
Distributed event streaming platform with durable, partitioned, replayable logs, Kafka Connect connectors and Kafka Streams processing
Apache-2.0Open sourceFreeSelf-hostedNov 2, 2026
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Elasticsearch
Elastic N.V. · Vector databases
Distributed search and analytics engine on Apache Lucene with full-text, aggregations, vector search and ES|QL; triple-licensed AGPL, SSPL and Elastic License
AGPL-3.0-only OR SSPL-1.0 OR Elastic-2.0Open sourceFreeSelf-hostedNov 2, 2026
Grafana
Grafana Labs · Monitoring & observability
Dashboarding and alerting platform that visualizes metrics, logs and traces from Prometheus, SQL databases and dozens of other data sources
AGPL-3.0-onlyOpen sourceFreemiumSelf-hostedNov 2, 2026
Metabase
Metabase, Inc. · BI & dashboards
Self-hostable BI tool with a no-code question builder, SQL editor, dashboards and embedding; AGPL open-source edition plus commercial Pro and Enterprise
AGPL-3.0Open sourceFreeSelf-hostedNov 2, 2026
OpenSearch
OpenSearch Software Foundation (Linux Foundation) · Vector databases
Apache-2.0 search and analytics suite forked from Elasticsearch and Kibana, governed by the OpenSearch Software Foundation
Apache-2.0Open sourceFreeSelf-hostedBroken
Slack
Slack Technologies (Salesforce) · Collaboration & communication
Channel-based team messaging platform from Salesforce with threads, huddles, canvases, workflow automation and an extensive bot and app API
ProprietaryFreemiumPaidNov 2, 2026
TimescaleDB
Tiger Data (formerly Timescale) · Relational databases
PostgreSQL extension for time-series data adding hypertables, compression and continuous aggregates, from the company now named Tiger Data
Apache-2.0 AND LicenseRef-Timescale-LicenseOpen sourceFreeSelf-hostedNov 2, 2026
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