CouchBase - Document-Oriented NoSQL Database
DBeaver - DBeaver - Universal Database Manager and SQL Client.
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
DataGrip - Tool for SQL and databases
memcached - High-performance, distributed memory object caching system
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.