Vespa alternatives for AI agents.

🔎 Open source distributed and RESTful search engine.

Apache Lucene open-source search software

Apache Solr open-source search software

Cognee is the open-source AI memory platform for agents. Give your AI agents persistent long-term memory across sessions with a self-hosted knowledge graph engine.

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

Free and Open Source, Distributed, RESTful Search Engine

Deeplake is AI Data Runtime for Agents. It provides serverless postgres with a multimodal datalake, enabling scalable retrieval and training.

🌌 A complete search engine and RAG pipeline in your browser, server or edge network with support for full-text, vector, and hybrid search in less than 2kb.

Data Agent Ready Warehouse : One for Analytics, Search, AI, Python Sandbox. — rebuilt from scratch. Unified architecture on your S3.

🦔 Fast, lightweight & schema-less search backend. An alternative to Elasticsearch that runs on a few MBs of RAM.

Cloud-native search engine for observability. An open-source alternative to Datadog, Elasticsearch, Loki, and Tempo.

Stop renting your intelligence. Own it with AnythingLLM. Everything you need for a powerful local-first agent experience

Qdrant - High-performance, massive-scale Vector Database and Vector Search Engine for the next generation of AI. Also available in the cloud https://cloud.qdrant.io/

Developer-friendly OSS embedded retrieval library for multimodal AI. Search More; Manage Less.

The Fastest Distributed Database for Transactional, Analytical, and AI Workloads.

SearXNG is a free internet metasearch engine which aggregates results from various search services and databases. Users are neither tracked nor profiled.