LINQ : LINQPad

 LINQPad lets you interactively query databases in a modern query language: LINQ.  Kiss goodbye to SQL Management Studio
LINQPad supports everything in C# 4.0/5.0 and Framework 4:

• LINQ to Objects
• LINQ to SQL, Entity Framework
• LINQ to XML
• Parallel LINQ
• OData / WCF Data Services - including StackOverflow, SharePoint, and Windows DataMarket
• Microsoft Reactive Framework

And that's not all - there's also specific support for:

• SQL Azure, SQL Table Storage, Oracle, SQLite and MySQL
• Microsoft StreamInsight
• Microsoft Dynamics CRM
• Third-party ORMs including Mindscape LightSpeed, LLBLGen, DevExpress eXpress Persistent Objects and DevForce
• (Even old-fashioned SQL!)

And LINQPad is more than a LINQ tool: it's an ergonomic C#/VB/F# scratchpad that instantly executes any expression, statement block or program with rich output formatting – the ultimate in dynamic development. Put an end to those hundreds of Visual Studio Console projects cluttering your source folder



Source : http://www.linqpad.net/