carrot2 ☆

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Description:
Search results clustering engine

Type: Formula | Latest Version: 4.8.3@0 | Tracked Since: Dec 17, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: clustering search nlp java information-retrieval machine-learning

Install: brew install carrot2

About:
Carrot2 is an open-source search results clustering engine that organizes search results into descriptive thematic groups. It provides a natural language alternative to traditional ranked lists, making large result sets more navigable. The engine supports multiple clustering algorithms and can be integrated as a library or used via its web UI.

Key Features:

Multiple clustering algorithms (Lingo, STC, Lingo3G)
Support for various document sources (Solr, Elasticsearch, file formats)
REST API and Java library integration
Web-based UI for testing and visualization
Customizable clustering parameters

Use Cases:

Improving search user experience by organizing results into topics
Analyzing large document collections to discover themes
Building faceted navigation for content-heavy websites
Enterprise knowledge management and document organization

Alternatives:

Elasticsearch – Elasticsearch offers basic aggregation but Carrot2 provides advanced thematic clustering
Solr – Solr has result grouping but Carrot2 specializes in semantic clustering
Voyant Tools – Voyant is for text analysis while Carrot2 focuses on search result organization

License: Apache-2.0

Dependencies: openjdk

Bottles available for: arm64_tahoe, arm64_sequoia, arm64_sonoma, sonoma, arm64_linux, x86_64_linux

Version History

Detected	Change	Commit
Sep 24, 2025 3:40pm	VERSION_BUMP	903082a3
Sep 15, 2024 3:52am	VERSION_BUMP	ce0c1b07
May 24, 2024 1:37pm	VERSION_BUMP	caf70781
May 24, 2024 12:27pm	VERSION_BUMP	4294b6dd
Nov 8, 2023 7:42am	VERSION_BUMP	2e77a13b
Apr 8, 2023 7:29am	VERSION_BUMP	0014ff8f
Apr 8, 2023 1:53am	VERSION_BUMP	e957fc02
Feb 16, 2023 4:36am	VERSION_BUMP	46ce8584
Nov 21, 2022 3:02am	VERSION_BUMP	810bd30c