LINQPad - A scratchpad for C#, F# and VB code including Linq queries.
Linqer - Linqer is a SQL to LINQ converter tool.
Snippet Compiler - Authors description: "Snippet Compiler compiles snippets."
Dot Net Editor - An VB/C# text editor with the ability to run code and code snippets.
Eclipse aCute - Eclipse aCute is an add-on that enhances the Eclipse IDE with multiple tools to help developers write efficient code in C# and its .NET Core framework.
Snippely - Snippely is a basic text and code organizational tool.