Quiver - Quiver is a notebook built for programmers.

LINQPad - A scratchpad for C#, F# and VB code including Linq queries.

Code Bank - Code Bank is a code snippet manager with support for a local database as well as a shared database.

Snippet Compiler - Authors description: "Snippet Compiler compiles snippets."

GitHub Gist - Gist is a simple way to share snippets and pastes with others.

Linqer - Linqer is a SQL to LINQ converter tool.