Databases for Content & catalogs

The web's default open-source SQL database, now on calendar versioning with 9.7 as the LTS line.

The default document database: flexible BSON documents, rich queries and built-in sharding.

Google's app platform: Firestore, Realtime Database and Data Connect, plus auth, functions and hosting.

Community-led MySQL fork with extra storage engines, built-in Galera and a faster feature cadence.

Serverless document database with realtime listeners, offline SDKs and a new Enterprise edition.

Microsoft's always-current managed SQL Server engine, from free serverless databases to 128 TB Hyperscale.

Open-source backend in one Go binary: SQLite database, auth, files, realtime and admin UI.

Low-code database app builder for Mac, Windows, iPad and web, owned by Apple's Claris.

Open-source backend platform with databases, auth, storage, functions and realtime, self-hosted or cloud.

AWS's managed service for six relational engines: PostgreSQL, MySQL, MariaDB, Oracle, SQL Server and Db2.

Apple's iCloud record store for apps: private per-user data, a public database and built-in sync.

Performance-focused managed MySQL (Vitess) and Postgres, with NVMe-backed Metal clusters and branching.

AWS's MySQL- and PostgreSQL-compatible engine on a shared, six-way replicated storage layer.

A drop-in MySQL build that ships enterprise features (thread pool, audit, encryption) as free GPL code.

Transparent persistence for Python objects with ACID transactions and history.

Enterprise multi-model database for XML, JSON and RDF with built-in search and semantic RAG.

CNCF-graduated sharding and clustering layer that makes a fleet of MySQL servers look like one database.

Git-for-data document and knowledge-graph database with branches, diffs and time travel.

Hybrid SQL/RDF engine that runs many of the largest public SPARQL endpoints.

Open-source native XML database and XQuery application platform for documents and digital editions.

Lightweight, fast native XML database and XQuery 3.1/4.0 processor with a GUI.

AWS's managed MongoDB-API database on a proprietary, Aurora-style storage layer.

Serverless Postgres from the Prisma ORM team, on unikernels, billed per operation with no cold starts.

Open-source backend platform on Postgres with Hasura GraphQL, auth, storage and functions.

Apache's Java Content Repository: a hierarchical, versioned node store with search, behind many Java CMSs.

Korean open-source RDBMS with built-in HA and Oracle-like SQL, common in Korean public sector.

Faceted-search and discovery engine (MDEX) that Oracle bought in 2011; now a frozen Oracle Commerce component.

Google Cloud's managed MySQL, PostgreSQL and SQL Server, with an Enterprise Plus tier for fast failover.

Percona Server plus Galera synchronous replication, packaged as an open-source HA MySQL cluster.

SAP's older relational database (ex-Adabas D/SAP DB), still under content servers and liveCache.

Apache-licensed MongoDB-protocol proxy that stores data in PostgreSQL with the DocumentDB extension.

Open-source Postgres platform with storage-level copy-on-write branching, scale-to-zero and anonymized clones.

Embeddable bitemporal database that keeps every revision of JSON and XML resources queryable.

Drop-in MongoDB Community build with enterprise features like encryption, LDAP and hot backup.

Serverless SQLite for Cloudflare Workers, priced per row read and written, with read replicas and time travel.

MIT-licensed, MongoDB-compatible document engine built as PostgreSQL extensions, run by the Linux Foundation.

Chinese distributed document database with native ACID storage, SQL instances and S3 API, used in many banks.

Dependency-free PHP library that stores schemaless documents as plain JSON files on disk.

Structured static database for game data: spreadsheet-style editor, typed sheets and diff-friendly JSON.

PHP library that treats JSON files as database tables, with an ORM-style query builder and relations.

Objective-C object database with Git-like branching, tree-structured undo and semantic merging built in.

Ruby transactional document store that keeps every change as a commit in a Git repository.

Append-only image database in Go with a built-in HTTP API and Lua-scripted image processing; idle since 2018.

Microsoft's managed MongoDB-compatible service, built on the open-source DocumentDB engine.

SYSCOM's ODBC-native SQL database from Taiwan, known for letting COBOL programs use SQL tables.

The extensible, standards-first open-source relational database.

Open-source Postgres backend platform: database, auth, storage, realtime and edge functions in one project.

HTTP/JSON document database built around multi-master replication and offline-first sync.

The original Lucene search server: battle-tested, Apache-governed, now with GPU-accelerated vectors.

ACID document database for .NET and beyond, with auto-indexing, Corax search and multi-master replication.

Serverless Postgres with copy-on-write branching and scale-to-zero, now part of Databricks.

Erlang-based, Dynamo-style key-value store built to stay up through ugly failures.

Standards-compliant RDF triplestore with reasoning, connectors and MCP support for GraphRAG.

MongoDB's own multi-cloud DBaaS, bundling search, vector search and stream processing.

Microsoft's managed community PostgreSQL, with zone-redundant HA, DiskANN vectors and Citus elastic clusters.