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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ClickHouse
ClickHouse, Inc. · Analytical engines & OLAP
Open-source columnar OLAP database server for fast aggregations over billions of rows, with MergeTree storage, SQL and a managed ClickHouse Cloud
Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026
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
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
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