LinqPad is an interactive C#/F#/VB.NET scratchpad that lets you run arbitrary C#/F#/VB.NET code, and also lets you query databases with linq.

Code quality tooling has become a bigger, and bigger industry. Tools like Resharper, and stylecop have been telling us how bad us human beings are at developing code.

The one problem I have always had with these tools is they dont go above and beyond to help you understand your code at a higher level.