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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 AI-powered Chat2Query free at : https://tidbcloud.com/free-trial

Free universal database tool and SQL client

ClickHouse® is a free analytics DBMS for big data

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.

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

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

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

REST API for any Postgres database

SQL powered operating system instrumentation, monitoring, and analytics.

MyBatis SQL mapper framework for Java

Distributed SQL transaction & query engine for data sharding, scaling, encryption, and more - on any database.

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

Dapper - a simple object mapper for .Net

📊 Cube — The Semantic Layer for Building Data Applications

Dolt – Git for Data

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