What are some alternatives?
When comparing dnSpy and GrayWolf, you can also consider the following products
dotPeek - dotPeek is a free tool based on ReSharper. It can reliably decompile any . NET assembly into C# or IL code. Download dotPeekCommunity. Materials Newsletters, webinars.
ILSpy - ICSharpCode. Decompiler. Console..
.NET Reflector - .
Telerik JustDecompile - Free. For everyone. Forever. With an open source decompilation engine
MSIL Disassembler - MSIL Disassembler is basically an IL disassembler that is companion tool to the IL assembler.
CFF Explorer Suite - CFF Explorer Suite is a freeware pack of many developing and editing tools like PE editor, process viewer, etc.