SQL Developer - Oracle SQL Developer is a free, development environment that simplifies the management of Oracle Database in both traditional and Cloud deployments.
LINQPad - A scratchpad for C#, F# and VB code including Linq queries.
Toad Edge - Windows GUI for MySQL. SQL Syntax Check. Freeware (Basic Features) & Payware (Extended Features).
LINQ Insight - Execute LINQ Queries directly from Visual Studio without building the application. Verify your LINQ queries in a single click and view data with LINQ Insight!
DbVisualizer - DbVisualizer is the universal database tool for developers, DBAs and analysts.
Linqer - Linqer is a SQL to LINQ converter tool.