ILSpy is described as 'The open-source .NET assembly browser and decompiler' and is a Decompiler in the development category. There are eight alternatives to ILSpy for Windows, .NET Framework, Mac and Linux. The best ILSpy alternative is dnSpy, which is both free and Open Source. Other great apps like ILSpy are dnSpyEx, dotPeek, .NET Reflector and Explorer Suite.
dnSpy is a debugger and .NET assembly editor. You can use it to edit and debug assemblies even if you don't have any source code available.
Almost everyone thinks dnSpy is a great ILSpy alternative.
dnSpy is the most popular Windows alternative to ILSpy.
dnSpy is the most popular Open Source & free alternative to ILSpy.
dnSpyEx is an unofficial continuation of the dnSpy project which is a debugger and .NET assembly editor. You can use it to edit and debug assemblies even if you don't have any source code available. Main features:
Great successor to dnSpy. Gives you access to more advanced features like editing the program. While generated code is often less accurate than IlSpy, it better handles obfuscation and anti-tampering solutions.
What's Cool about dotPeek? Decompiling .NET 1.0-4.0 assemblies to C# Quick jump to a specific type, assembly, symbol, or type member Effortless navigation to symbol declarations, implementations, derived and base symbols, and more Accurate search for symbol usages with advanc.
.NET Reflector is the most popular commercial alternative to ILSpy.
Created by Daniel Pistelli, a freeware suite of tools including a PE editor called CFF Explorer and a process viewer. The PE editor has full support for PE32/64. Special fields description and modification (.
The MSIL Disassembler is a companion tool to the MSIL Assembler (Ilasm.exe). Ildasm.exe takes a portable executable (PE) file that contains Microsoft intermediate language (MSIL) code and creates a text file suitable as input to Ilasm.exe.
CFR will decompile modern Java features - Java 8 lambdas (pre and post Java beta 103 changes), Java 7 String switches etc, but is written entirely in Java 6. [ http://www.benf.org/other/cfr/ ].
They are both decompilers, but ILSpy is for Microsoft MSIL used in C#/F#/VB &c., while CFR is for JVM ByteCodes, using in Java and a pile of other JVM languages ... so while they have the same theoretical "function", they don't overlap at all in actual use!
CFR is the most popular Mac & Linux alternative to ILSpy.
GrayWolf is a .NET Decompiler that can edit the IL of a compiled .NET application. This Decompiler is targeted at hacking compiled .NET applications. This is a Beta product the IL editing is lacking and the deobfuscator is just getting going.
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Fully featured, allows quick export to VS project, decompiles working code, handles private implementations correctly unlike dotPeek.