Spatial databases

The standard spatial extension for PostgreSQL: geometry, geography, rasters and topology in SQL.

In-memory geospatial database and geofencing server that speaks the Redis protocol and HTTP.

Frank Denis's in-memory, persistent store for geographic points and key/value records with an HTTP/JSON API.

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

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.

Lucene-based distributed search and analytics engine for text, vectors, logs and metrics.

Fully managed cloud data warehouse with separate storage and compute, now spanning AI and apps.

Microsoft's flagship RDBMS: T-SQL, columnstore, Always On, and now native vectors and JSON.

Google's serverless, pay-per-query data warehouse built on Dremel and Colossus.

In-process columnar SQL database: the SQLite of analytics, running inside your app or notebook.

The enterprise heavyweight: RAC, Data Guard and a converged engine for SQL, JSON, graph and vectors.

Apache-licensed, foundation-governed fork of Elasticsearch for search, vectors and observability.

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

AWS's MPP columnar data warehouse, available as provisioned RA3 clusters or Serverless.

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

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

Postgres-wire distributed SQL built to survive node, zone and region failures with serializable transactions.

IBM's enterprise RDBMS for Linux, UNIX, Windows and z/OS, with BLU columnar and pureScale clustering.

Flash-optimized distributed key-value and document database for predictable sub-millisecond latency at scale.

Native multi-model database: documents, graphs, search and vectors behind one query language.

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

SAP's in-memory columnar HTAP database, the mandatory engine under S/4HANA.

The Java search library at the heart of Elasticsearch, OpenSearch and Solr, now with HNSW vectors.

The original MPP data warehouse, now VantageCloud with open table formats and in-database analytics.

Real PostgreSQL compiled to WebAssembly: an embeddable Postgres for browsers, Node, Bun and Deno.

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

Open-source JSON database that pushes live query results to apps through changefeeds.

Veteran MPP columnar analytics database from the C-Store lineage, now owned by Rocket Software.

IBM's managed, CouchDB-compatible JSON database with built-in search and geospatial queries.

In-memory MPP columnar analytics database from Germany, tuned for fast BI with little tuning.

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.

Distributed SQL mixing in-memory rowstore and columnstore for real-time analytics, search and vectors.

Rust multi-model database (documents, graph, vectors, live queries) that runs embedded, in WASM or clustered.

Early Java multi-model database mixing documents, graphs and objects, now in patch-only mode.

Memory-first distributed JSON database with SQL++, search, vector indexes and mobile sync.

Distributed SQL database built on Lucene for real-time analytics over machine, IoT and JSON data.

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

Low-maintenance embeddable RDBMS with built-in TimeSeries, still quietly running retail and telco systems.

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

Pioneering open-source column-store from CWI, still a lean research-grade analytical SQL database.

Fast pure-Java SQL engine for embedded, in-memory and test databases, with compatibility modes.

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

Self-tuning embeddable SQL database with MobiLink sync, still shipped inside ISV apps but frozen at v17.

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

Postgres extension that shards tables across nodes for multi-tenant SaaS and real-time analytics.

Serverless SQL warehouses on the Databricks lakehouse, powered by the Photon C++ engine.

PostgreSQL-based MPP data warehouse, closed-sourced by Broadcom in 2024 and sold in Tanzu Data.

In-memory, partitioned SQL engine running Java stored procedures serially for millisecond decisioning.

Alipay-proven distributed SQL with MySQL (and Oracle, in Enterprise) compatibility, HTAP and vector search.

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

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

Rust-built cloud data warehouse on object storage, open source with a managed Databend Cloud.

Postgres extensions from Snowflake that read and write Iceberg tables and lake files, executed via DuckDB.

Oracle's engineered system for Oracle Database, with smart storage offload for OLTP and analytics.

GPU-native columnar SQL database with visual analytics, fully open-sourced by NVIDIA in 2026.

Oracle's sharded key-value and JSON store, available as Apache-licensed software or an OCI service.

EnterpriseDB's PostgreSQL with deep Oracle compatibility: PL/SQL packages, DBMS_* and TDE.

Pure-Go full-text, geo and vector indexing library from Couchbase.

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

Fully open-source multi-master distributed PostgreSQL built on the Spock logical replication extension.

Open-source MPP warehouse forked from Greenplum and rebased on a newer PostgreSQL kernel.

GPU- and vector-accelerated database for real-time spatial, time-series and vector analytics.

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

Korean hybrid in-memory/on-disk RDBMS for telecom and finance, closed-source again since 2023.

Apache-licensed PostgreSQL distribution with an Oracle-compatible mode, PL/iSQL and Oracle packages.

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

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

PostgreSQL-compatible MPP warehouse that runs on its appliance, any cloud or Kubernetes.

Array database for massive multidimensional rasters, with SQL-style queries and OGC WCPS services.

Embeddable in-memory key/value store for Go with ACID transactions, custom and spatial indexes, and TTLs.

Hyperscale data warehouse on NVMe compute-adjacent storage, rebranded as the OcientAIQ platform.

Google's Postgres-compatible service with disaggregated storage, a columnar engine and ScaNN vectors.

Distributed vector database from DataJaguar that also handles time series and geospatial data.

Alibaba Cloud's shared-storage relational service in MySQL-, PostgreSQL- and Oracle-compatible editions.

Embedded NoSQL document store for Java and Android with pluggable MVStore or RocksDB storage.

McObject's embedded object database for Java and .NET, dual-licensed GPL or commercial.

Apache parallel database for semi-structured JSON data with SQL++, LSM storage and spatial/text indexes.

Distributed shared-nothing SQL database built to serve the Rubin Observatory's petascale sky catalogs.

Oracle's managed MySQL with an in-memory columnar engine for analytics, lakehouse, ML and vector search.

Crunchy Data's developer-friendly managed Postgres across AWS, GCP and Azure, now owned by Snowflake.

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

IBM's MPP analytics edition of Db2 with BLU columnar acceleration, as software or SaaS.

Ekky Software's embedded C++ object database with B+tree, spatial, full-text and pattern indexes.

Self-driving Oracle Database on Exadata: auto-patching, auto-scaling, and Select AI, on OCI and other clouds.

Russian commercial PostgreSQL distribution with multimaster, 64-bit XIDs and compressed storage.