SQL

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Apache Spark - A unified analytics engine for large-scale data processing

TiDB is an open-source, cloud-native, distributed, MySQL-Compatible database for elastic scale and real-time analytics. Try free: https://tidbcloud.com/free-trial

Free universal database tool and SQL client

Feature-rich ORM for modern Node.js and TypeScript, it supports PostgreSQL (with JSON and JSONB support), MySQL, MariaDB, SQLite, MS SQL Server, Snowflake, Oracle DB (v6), DB2 and DB2 for IBM i.

ClickHouse® is a free analytics DBMS for big data

CockroachDB - the open source, cloud-native distributed SQL database.

Apache Flink

TDengine is an open source, high-performance, cloud native time-series database optimized for Internet of Things (IoT), Connected Cars, Industrial IoT and DevOps.

SQL powered operating system instrumentation, monitoring, and analytics.

REST API for any Postgres database

The Modern Data Stack 🐰 — Directus is an instant REST+GraphQL API and intuitive no-code data collaboration app for any SQL database.

MyBatis SQL mapper framework for Java

Ecosystem to transform any database into a distributed database system, and enhance it with sharding, elastic scaling, encryption features & more

A query builder for PostgreSQL, MySQL, CockroachDB, SQL Server, SQLite3 and Oracle, designed to be flexible, portable, and fun to use.

A scalable, distributed, collaborative, document-graph database, for the realtime web

Dapper - a simple object mapper for .Net

The official home of the Presto distributed SQL query engine for big data

📊 Cube — Headless Business Intelligence for Building Data Applications

An open-source time-series SQL database optimized for fast ingest and complex queries. Packaged as a PostgreSQL extension.