ArangoDB

Gel

Gel, formerly known as EdgeDB, is an open-source data platform built on top of Postgres that replaces traditional tables with schema-defined types connected through graph-style links, letting developers traverse relationships without writing JOINs. It uses EdgeQL, a query language that combines SQL and GraphQL-style concepts with strict typing, and provides code generation and client libraries for full type safety across the stack. Beyond querying, Gel includes built-in authentication covering OAuth, passkeys, magic links, and email/password, plus integrated AI support with automatic embeddings and RAG endpoints. It can run locally with zero-config setup, be exported to plain Postgres, or run on the managed Gel Cloud service, which is AWS-powered and integrates with GitHub and Vercel; the project has around 14,000 GitHub stars and recently joined Vercel while remaining fully open source.

SurrealDB

SurrealDB is a cloud‑native, distributed database that combines the flexibility of NoSQL with the power of SQL‑style querying. It delivers strong ACID guarantees while scaling horizontally for modern applications. Designed for developers and startups, SurrealDB offers seamless integration with popular languages and frameworks, making it easy to embed real‑time data capabilities into web and mobile services.

Weaviate

Weaviate is an open-source, cloud‑native vector database that stores data as objects with embedded vectors, enabling fast similarity search and semantic retrieval. It integrates seamlessly with large language models and offers a GraphQL and REST API for developers to build AI‑driven applications. The platform supports hybrid search, filters, and custom modules, and can be deployed on-premises or as a managed SaaS. Its modular architecture lets you add modules for text2vec, image2vec, and more, reducing hallucination and data leakage in AI pipelines.