LINQPad is a software utility targeted at Microsoft .NET development. It is used to interactively query SQL databases (among other data sources such as OData or WCF Data Services) using LINQ, as well as interactively writing C# code without the need for an IDE. This expands its use to a general "test workbench" where C# code can be quickly prototyped outside of Visual Studio. It can also be used to write code in the VB.NET, SQL and F# languages.
This product is freemium, keeping the C# auto-complete feature disabled until the user purchases a license.