Quiver - Quiver is a notebook built for programmers.
LINQPad - A scratchpad for C#, F# and VB code including Linq queries.
Snippely - Snippely is a basic text and code organizational tool.
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!
GitHub Gist - Gist is a simple way to share snippets and pastes with others.
Dot Net Editor - An VB/C# text editor with the ability to run code and code snippets.