ILSpy is an open-source .NET assembly browser and decompiler like Red Gates Reflector which recently dropped their free version. ILSpy is very easy to use and can decompile a .NET assembly to IL or C# code. I often use it to learn more of the internals of the .NET framework or a third party plugin/framework. However I found it tedious to locate the assembly I wanted to decompile in Windows Explorer and open it in ILSpy. Then I came across Eric Carr’s Visual Studio plugin for ILSpy. It creates a “Browse source”-shortcut in the “Tools” menu of Visual Studio and opens the currently highlighted class, property, or method in ILSpy.
I have encouraged Eric Carr to release the plugin as open source, but at the moment you can download a MSI installer of the plugin.