PE Explorer 

PE Explorer makes it easy to view, analyze and edit win32 executable files (EXE, DLL, SYS, ActiveX). Offers easy-to-use tools such as a Visual Resource Editor, powerful Win32 Disassembler, DLL Export Viewer, UPX Unpacker and Dependency Scanner.
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.NET decompiler Dis# 

Dis# is a .NET decompiler which allows you to edit local variables and other names in the decompiled code and keep the changes in a project file. With Dis#, the decompiled code is similar to the original source. A trial version is available.
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.NET Reactor 

.NET Reactor protects your intellectual property by mixing any pure .NET Assembly (written in C#, VB.NET, Delphi.NET, J#, MSIL) with conventional native code. In detail, .NET Reactor builds a native wall between potential hackers and your .NET code.
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