PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
Presto DB - Distributed SQL Query Engine for Big Data (by Facebook)
SQLite - SQLite Home Page
Apache Spark - Apache Spark is an engine for big data processing, with built-in modules for streaming, SQL, machine learning and graph processing.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Google BigQuery - A fully managed data warehouse for large-scale data analytics.