Toad for Oracle - Toad is an industry-standard tool for application development.
phpMyAdmin - phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL over the Web.
Sequel Pro - MySQL database management for Mac OS X
SQL Developer - Oracle SQL Developer is a free, development environment that simplifies the management of Oracle Database in both traditional and Cloud deployments.
DBeaver - DBeaver - Universal Database Manager and SQL Client.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.