MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
DBeaver - DBeaver - Universal Database Manager and SQL Client.
BaseX - BaseX is a very light-weight, high-performance and scalable XML Database engine and XPath/XQuery...
DataGrip - Tool for SQL and databases
eXistdb - High-performance native XML database engine and all-in-one solution for application building.
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.