Information Retrieval GitHub Repositories (2026) · Open Source Tools

📑 PageIndex: Document Index for Vectorless, Reasoning-based RAG

Open-source inference server and production cluster for all the models your agent needs.

Open-source AI orchestration framework for building context-engineered, production-ready LLM applications. Design modular pipelines and agent workflows with explicit control over retrieval, routing, memory, and generation. Built for scalable agents, RAG, multimodal applications, semantic search, and conversational systems.

Private AI platform for agents, assistants and enterprise search. Built-in Agent Builder, Deep research, Document analysis, Multi-model support, and API connectivity for agents.

MTEB: State-of-the-art evaluation of embeddings across languages and modalities

Anserini is a Lucene toolkit for reproducible information retrieval research

Embedded retrieval library built on Parquet. Fast, efficient, and scalable.

Apache Lucene open-source search software

💡 All-in-one AI framework for semantic search, LLM orchestration and language model workflows

Harness LLMs with Multi-Agent Programming

Pyserini is a Python toolkit for reproducible information retrieval research with sparse and dense representations.

Fetches system/theme information in terminal for Linux desktop screenshots.

Apache Solr open-source search software

Straightforward fuzzy matching, information retrieval and NLP building blocks for JavaScript.

Language model search engine built on a vector database and an anything key/value store.

Improve your OpenSearch, Elasticsearch, Solr, Vectara, Algolia and Custom Search search quality.

Official Kubernetes operator for Apache Solr

Official repository of the Seismic library.

PatZilla is a modular patent information research platform and data integration toolkit with a modern user interface and access to multiple data sources.