SQL Developer - Oracle SQL Developer is a free, development environment that simplifies the management of Oracle Database in both traditional and Cloud deployments.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Toad Edge - Windows GUI for MySQL. SQL Syntax Check. Freeware (Basic Features) & Payware (Extended Features).
CouchDB - HTTP + JSON document database with Map Reduce views and peer-based replication
DbVisualizer - DbVisualizer is the universal database tool for developers, DBAs and analysts.
Amazon DynamoDB - Amazon DynamoDB is a fully managed NoSQL database service offered by Amazon.