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.

Hexagonal hierarchical geospatial indexing system

A query and indexing engine for Redis, providing secondary indexing, full-text search, vector similarity search and aggregations.

OrientDB is the most versatile DBMS supporting Graph, Document, Reactive, Full-Text and Geospatial models in one Multi-Model product. OrientDB can run distributed (Multi-Master), supports SQL, ACID Transactions, Full-Text indexing and Reactive Queries.

A search engine that "just works" for Obsidian. Supports OCR and PDF indexing.

Internet search engine for text-oriented websites. Indexing the small, old and weird web.

Endee.io – A high-performance vector database, designed to handle up to 1B vectors on a single node, delivering significant performance gains through optimized indexing and execution. Also available in cloud https://endee.io/

TypeScript ETL toolkit for indexing Ethereum, Solana, and Substrate data, sourced from SQD Network.

BuntDB is an embeddable, in-memory key/value database for Go with custom indexing and geospatial support

Highly Performant, Modular, Memory Safe and Production-ready Inference, Ingestion and Indexing built in Rust 🦀

h3-js provides a JavaScript version of H3, a hexagon-based geospatial indexing system.

Python bindings for H3, a hierarchical hexagonal geospatial indexing system