Relational databases

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 in-process SQL engine that ships in every phone, browser and OS: one file, zero servers.

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

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

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

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

Spark's SQL and DataFrame engine for large-scale batch, streaming and lakehouse processing.

Fast distributed SQL query engine for federated analytics across lakes and databases.

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

Desktop database and forms builder bundled with Microsoft 365; still everywhere in back offices.

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

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

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

Distributed SQL query engine from Meta for interactive queries over data lakes and many sources.

MySQL-compatible distributed SQL with a row store for OLTP and a columnar replica for real-time analytics.

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

Google's globally consistent, horizontally scaling SQL service with graph, vector and full-text built in.

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

Lightweight, MVCC relational database from the InterBase lineage, embeddable or client-server.

Apache-licensed distributed SQL that reuses the PostgreSQL query layer on a Raft-replicated storage engine.

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.

The original microcomputer database and xBase language, still sold as a Windows IDE built on DBF tables.

Read-path sync engine that streams partial replicas of Postgres to clients over plain HTTP.

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

The original SQL-on-Hadoop warehouse, now mostly valued for its Metastore and Iceberg support.

Turso's open-contribution SQLite fork with native vectors, a network server and embedded replicas.

Low-latency MPP SQL engine for Hadoop, Kudu and Iceberg tables, developed largely by Cloudera.

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

The original Sybase T-SQL engine, still running trading and SAP systems but firmly in SAP's sunset lane.

Open-source distributed SQL from Yandex combining row and column tables, topics and vector search.

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

In-memory relational database that runs your server logic as WASM modules and streams changes to clients.

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.

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

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.

Ground-up Rust rewrite of SQLite with concurrent writes, async I/O, CDC and vector search.

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

Sync engine that keeps on-device SQLite in sync with Postgres, MongoDB, MySQL or SQL Server.

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.

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

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

An SQS-style message queue implemented as a lightweight Postgres extension.

Query-driven sync engine: clients run ZQL locally against a Postgres-backed cache for instant UIs.

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.

Integrated RDBMS plus ABL 4GL application platform behind thousands of ERP and vertical business apps.

Pure-JavaScript in-memory SQL engine for browsers and Node.js that queries arrays, JSON, CSV and Excel files.

Serverless AWS query service running Trino-based SQL directly over data in S3.

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

Embarcadero's small-footprint SQL database for servers and embedded apps, with built-in AES encryption.

MySQL-compatible SQL database you can branch, diff, merge and clone like a Git repository.

Lazy-loading reactive database for React Native and React apps, built on SQLite.

SQLite with transparent 256-bit AES encryption of the whole database file.

An Apache-licensed, Postgres-compatible streaming database that stores state on S3 and writes Iceberg.

One of the original relational databases, still sold by Actian for long-lived enterprise systems.

An incremental SQL engine grounded in DBSP theory that updates any SQL query from changes only.

A Postgres-compatible operational data warehouse that keeps SQL views incrementally up to date.

Event-sourced local-first data layer: reactive SQLite on the client, rebuilt from a synced event log.

Classic 1985 desktop relational database with Query by Example; now a frozen extra in WordPerfect Office.

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

IBM's FPGA-accelerated MPP warehouse, now offered as NPS on-prem, in Cloud Pak and as a service.

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

Immutable Datalog database from Nubank where every fact is timestamped and queries run in the app process.

PostgreSQL extension that embeds DuckDB's vectorized engine for fast analytics and data-lake queries.

Serverless, active-active distributed SQL on AWS with PostgreSQL compatibility and no instances to size.

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

Lightweight distributed database that replicates SQLite over Raft behind a simple HTTP API.

Rust-native, Spark Connect-compatible engine for SQL, DataFrame and streaming jobs without the JVM.

Local-first TypeScript platform: SQLite on each device, end-to-end encrypted sync through relays.

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

Managed, distributed SQLite with pub/sub, edge functions and CRDT sync to on-device databases.

Confluent's SQL layer over Kafka Streams, still supported but superseded by Flink SQL for new work.

Multi-model data platform (SQL, objects, globals, vectors) with built-in interoperability, big in healthcare.

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

French integrated database and app-development platform for desktop, client/server and web apps.

Iceberg-native lakehouse query engine with reflections for acceleration, owned by SAP since 2026.

A wire-compatible SQL cache for Postgres and MySQL that keeps cached queries fresh from replication.

Java ROLAP engine that answers MDX queries by generating SQL against your relational warehouse.

Alpha-stage, Vitess-inspired sharding, pooling and HA layer for unmodified PostgreSQL, led by Supabase.

Version-controlled SQL database with PostgreSQL compatibility: branch, diff and merge your tables.

Elastic distributed SQL with in-memory transaction engines and separate storage managers, owned by Dassault.

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

The Btrieve/Pervasive lineage: zero-admin embedded database with key-level and SQL access, now edge-focused.

Shared-nothing, auto-sharded in-memory MySQL engine built for telecom-grade availability.

Cloud-native storage engine for PostgreSQL with undo logs, no VACUUM bloat and row-level WAL.

Bloomberg's clustered relational database with optimistic concurrency and synchronous replication.

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

Managed SQLite-compatible cloud for database-per-tenant apps, with embedded replicas and offline sync.

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

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

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

Synchronous multi-primary replication for MySQL and MariaDB, now owned by MariaDB plc.

Apache sharding middleware that adds sharding, read/write splitting and encryption over MySQL or Postgres.

Oracle's in-memory relational database: microsecond SQL, PL/SQL, and a cache tier for Oracle Database.

Long-running pure-Java SQL database with strong SQL:2023 coverage, used embedded and in LibreOffice.

Serverless Postgres that makes tenants a first-class primitive, with per-tenant isolation and placement.

Swedish standards-strict SQL engine built for embedded, automotive and real-time systems.

Canonical's embeddable C library that makes SQLite highly available with Raft replication.

Bitemporal SQL database on object storage that keeps every version of every row.

The commercial, enterprise-hardened distribution of Apache Ignite for low-latency SQL and compute.

Lakehouse compute engine that runs SQL on Iceberg, Delta and Hudi in your own cloud account.

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

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

Huawei's distributed enterprise RDBMS built on openGauss, aimed at replacing Oracle in Chinese finance.

Desktop database born on the Commodore 64 in 1983, still sold as Superbase NG with the SIMPOL language.

China's leading home-grown RDBMS; DM9 (2026) adds distributed, HTAP and AI features.

Huawei-originated open-source RDBMS forked from PostgreSQL, with in-memory and column engines.

1980s PC relational database and RAD tool, still sold today with builds for legacy DOS and Windows apps.

A Postgres extension that keeps materialized views updated incrementally inside the same transaction.

MySQL-compatible cloud-native HTAP database on object storage, with vector search and snapshots.

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

Open-source, durable Datalog database for Clojure with Datomic-style immutable history.

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.

A Rust stream processor with SQL pipelines, now owned by Cloudflare and powering Cloudflare Pipelines.

Alibaba's open-source, MySQL-compatible shared-nothing distributed SQL with Paxos and columnar indexes.

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

DEC's relational database for OpenVMS, owned by Oracle since 1994 and still updated on Alpha and Itanium.

Low-latency in-memory plus on-disk SQL database with HotStandby failover, sold today by UNICOM.

Lets PostgreSQL understand SQL Server's T-SQL and TDS protocol, so SQL Server apps can migrate.

Windows desktop relational database and 4GL app builder, sold continuously since the 1980s; now at R:BASE 11.

The relational database built into IBM i (AS/400), integrated with the OS and object security.

Fault-tolerant, shared-nothing SQL on HPE NonStop, built for payment switches that can never go down.

Hughes Technologies' lightweight 1994 SQL server that powered early dynamic websites before MySQL.

Byzantine-fault-tolerant, blockchain-backed SQL database built on SQLite; dormant since 2021.

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

Commercial embedded and client/server SQL database for Delphi and C++Builder, successor to FlashFiler.

SQL Server's built-in lock-free, memory-optimized OLTP engine with natively compiled T-SQL.

Compact in-memory and flash relational DBMS for embedded, telecom and SCADA systems, sold by Enea.

Veteran embedded SQL RDBMS for RTOS and Unix devices, still sold but with little visible development.

Chinese Java OLTP database derived from H2, now repositioned as an AI agent platform built on its SQL engine.

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

Expensify's WAN-replicated SQLite server with Paxos leader election, MySQL protocol and job/cache plugins.

Compact German SQL RDBMS from Transaction Software, with a Z-curve multidimensional index (Hypercube).

Baidu's MySQL-compatible distributed HTAP database on RocksDB and Raft, with full-text and vector indexes.

1988 DOS-era SQL server built for IBM DB2 compatibility; lives on inside Micro Focus mainframe tools.

Carlo Strozzi's 1998 shell-based relational database of plain-text tables and Unix pipe operators.

Embedded, single-file SQL database for .NET with a T-SQL dialect and ADO.NET provider.

Paradigma Software's multi-engine server: ValentinaDB, DuckDB and SQLite plus report and form servers.

JVM-embeddable distributed SQL database replicated with Apache BookKeeper and ZooKeeper.

Downloadable Spanner that runs on your own servers, other clouds or a laptop, with Paxos and auto-sharding.

Desktop 'true relational' DBMS implementing Date and Darwen's Tutorial D, for teaching and prototyping.

Managed horizontal sharding for Aurora PostgreSQL: one endpoint over a serverless group of shards.

Databricks' serverless Postgres built on Neon tech, with branching and sync to Delta tables in Unity Catalog.

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

Korean Oracle-compatible RDBMS with RAC-style Active Cluster, popular for Oracle exits in Asia.

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

One developer's ISO-SQL relational server written in Delphi, with MVCC; open-sourced under GPL in 2012.

Single-file PHP flat-file database that stores tables as TSV files and runs a tiny SQL-like dialect.

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

Proprietary ACID 'algorithmic' database from Indianapolis claiming extreme speed without conventional indexes.

Keyed-file ISAM database plus SQL engine bundled with BASIS International's BBj Business BASIC platform.

FairCom's embeddable ISAM, SQL and JSON database engine, now sold as FairCom DB; roots in 1984's c-tree.

Flat-file relational database at the heart of BRTT's Antelope seismic and environmental monitoring suite.

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

Low-cost Windows desktop database in the Access mould: tables, forms, reports and LAN multi-user access.

Royalty-free embedded and client/server SQL engine for Delphi, C++Builder, Lazarus, .NET, ODBC and PHP apps.

An incremental view engine that keeps complex SQL results fresh inside your existing Postgres or MySQL.

Chinese commercial database family: GBase 8a analytics, 8s transactional cluster, 8c distributed.

Chinese PostgreSQL-derived RDBMS with Oracle, MySQL and SQL Server compatibility modes.

Russian certified relational DBMS from RELEX, used in secure government, defence and real-time systems.

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.

Small-footprint embedded database with SQL and network-model APIs for RTOS, edge and safety-certified devices.

Pure-Java embedded SQL database with a JDBC 3.0 interface for desktop apps; last release in 2011.

Tiny main-memory SQL database for Windows and Linux built to make unit testing easy; last updated 2003.

Low-cost Informix-SE and ESQL/C compatible SQL engine for Linux, UNIX, Windows and VMS from Infoflex.

Commercial Trino platform: self-managed Starburst Enterprise and the Starburst Galaxy SaaS.

Cincom's mainframe relational DBMS for high-volume OLTP, the SQL half of the SUPRA family.

Tencent's financial-grade MySQL-compatible database family: distributed TDSQL and cloud-native TDSQL-C.

Parallel, vectorized SQL analytics engine on PostgreSQL roots, once an FPGA appliance, now cloud software.

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

Open-source columnar OLAP database known for very fast aggregations over billions of rows.

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

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.

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

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

PostgreSQL extension adding hypertables, columnar compression and continuous aggregates for time series.

The standard Postgres extension for vector similarity search with HNSW and IVFFlat indexes.

Serverless cloud data warehouse built on DuckDB, with hybrid local-plus-cloud execution.

Real-time analytics database for sub-second slice-and-dice over streaming event data.

Columnar time-series SQL database built for market data and very high ingest rates.

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

Column-store time-series engine with the q language, a fixture of capital-markets tick data.

Extensible Rust query engine library on Apache Arrow for building databases and data systems.

Dependency-free SQLite extension for vector search that runs anywhere SQLite does, including WASM.

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

Real-time OLAP store from LinkedIn for user-facing analytics at very high query rates.

A distributed, memory-first SQL database and compute grid; Ignite 3 rebuilt it around Raft and Calcite.

Elasticsearch-quality BM25 search and fast aggregations inside Postgres via the pg_search extension.

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

Apache time-series database for industrial IoT with tree and table models and edge-to-cloud sync.

In-memory database and Lua application server in one process, with an optional disk engine.

Embedded, in-process OLAP engine powered by ClickHouse, used mainly from Python.

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

PostgreSQL extension that adds openCypher graph queries alongside SQL.

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

Full-stack syncing database for TypeScript apps; development has stalled since 2025.

Columnar storage engine for fast analytics on fast-changing data, paired with Impala or Spark.

Tiny reactive in-memory store for tables and values, with persisters and CRDT sync.

Industrial-IoT time-series database with a table-per-device model and built-in streaming and caching.

Immutable, tamper-evident database with cryptographic proofs, offering key-value, SQL and document APIs.

OLAP engine that pre-computes cubes and aggregate indexes for sub-second SQL on huge datasets.

A single C++ binary for streaming SQL, built on ClickHouse's engine with streams and windows.

Real-time MPP analytical database with MySQL compatibility, search indexes and lakehouse access.

MPP OLAP database with a fast vectorized engine, real-time upserts and native lakehouse queries.

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

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

AI-native C++ database for hybrid search over dense, sparse, multi-vector (tensor) and full text.

Streaming lakehouse table format with LSM-based upserts and changelogs, born in Apache Flink.

Local-first database with built-in sync, permissions and edit history, being rebuilt as a relational Jazz 2.

Embedded Datalog database blending relational, graph and vector queries; dormant since 2024.

TigerData's Postgres extension adding StreamingDiskANN indexes on top of pgvector.

Disk-friendly Postgres vector extension using IVF + RaBitQ, the successor to pgvecto.rs.

Managed ClickHouse platform that turns SQL pipes into low-latency, versioned HTTP APIs.

Sybase's pioneering columnar warehouse, now SAP IQ and the engine behind HANA Cloud's data lake.

Distributed time-series database and scripting platform for quant finance and industrial analytics.

Postgres extension that mirrors tables into Iceberg columnstores for real-time analytics via DuckDB.

Toshiba's memory-first container database for IoT time series, with per-container ACID and SQL.

PostgreSQL fork with a built-in property graph model, mixing SQL, openCypher and ISO GQL.

Low-latency analytical database with a Postgres-compliant dialect, as cloud service or self-hosted Core.

Azure analytics service combining MPP dedicated SQL pools, serverless SQL and Spark.

Single-threaded stateful actors at the edge, each with its own strongly consistent SQLite store.

T-SQL warehouse in Microsoft Fabric that stores every table as Delta Parquet in OneLake.

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

CODASYL network-model mainframe database, now Broadcom's, still running decades-old COBOL systems.

Postgres vector extension built on USearch HNSW; development has stalled since late 2024.

Compressed columnar analytics engine on a MySQL front end, now sold by IgniteTech as Infobright AI.

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

Embedded in-memory and hybrid database for devices, real-time systems and time-series analytics.

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

Actian's vectorized columnar analytics database, born from CWI's X100; renamed Analytics Engine in 2026.

In-memory OLAP aggregation engine for bank risk analytics, renamed Atoti Server by ActiveViam.

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

Korean time-series database for sensor data, bundled with MQTT, HTTP and dashboards in one binary.

In-memory .NET application platform where C# classes are database tables, with no ORM in between.

Commercial cloud and enterprise distribution of Apache Doris from its core maintainers.

Experimental Rust columnar analytics engine built to scan billions of rows per second on one machine.

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

Columnar tick database and array language from Kona's author, with JSON and SQL syntax; open-sourced in 2022.

Commercial in-memory columnar SQL engine for .NET that speeds up reporting over hundreds of millions of rows.

Hosted columnar analytics platform with a spreadsheet-style interface, owned by SymphonyAI since 2023.

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

Embedded time-series and relational database for microcontrollers, RTOS and edge AI devices.

Kellerman Software's commercial embedded object/relational database for .NET, Xamarin and Unity apps.

The original commercial Pick MultiValue database (1973), still sold and updated by NEC Software Solutions.

Fujitsu BS2000 mainframe DBMS combining a CODASYL network model with SQL on the same data.