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dnSpy

.NET assembly editor, decompiler, and debugger

18 Alternatives To dnSpy

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Binary Ninja

A reverse engineering platform and GUI

Bytecode Viewer

A Java 8 Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More)

CFF Explorer Suite

CFF Explorer Suite is a freeware pack of many developing and editing tools like PE editor, process viewer, etc.

CFR

CFR is a JVM bytecode decompiler - it will decompile modern Java features - up to and including much of Java 9, but is written entirely in Java 6, so will work anywhere!

Cavaj Java Decompiler

Download Cavaj Java Decompiler - A useful application that will enable developers to easily load, view and edit class files in order to rebuild the Java source code

Free UPX

Graphical interface for the UPX packer, UPX 3.91w, UPX 3.92w, UPX 3.93w, UPX 3.94w, Ultimate Packer for eXecutables, EXE packer

GrayWolf

GrayWolf is a .NET Decompiler that can edit the IL of a compiled .NET application.
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ILSpy

ICSharpCode. Decompiler. Console..
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Java Class File Editor

classeditor - tool to edit class file binaries

MSIL Disassembler

MSIL Disassembler is basically an IL disassembler that is companion tool to the IL assembler.

MonoDevelop

MonoDevelop enables developers to write desktop and web applications on Linux, Windows and Mac OS X.
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PEBrowse64 Professional

PEBrowse64 Professional is a disassembler and static-analysis application that can be only used for the MS.
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Procyon

A suite of Java metaprogramming tools focused on code generation, analysis, and decompilation.
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Qt Creator

Qt Creator is a cross-platform C++, JavaScript and QML integrated development environment. It is the fastest, easiest and most fun experience a C++ developer could wish for.

UPX Graphical

Graphical GUI incl UPX 3.07 and a scrambler. Support Drag & Drop and context-menu.

WWPack32

WWPack32 - Windows executable files compressor and protector.

Zeta Resource Editor

Download Zeta Resource Editor. Zeta Resource Editor is a free application that enables you to edit standard Microsoft . NET string resources from multiple different resource files together inside one single data grid.
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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.