An obfuscator can obfuscate .NET IL Code and protect .NET dll/exe assembly. Obfuscated code is unreadable and unmodifiable, it may anti-decompile and cause decompiler crashed (e.g. .NET Reflector). Obfuscator.NET supports name obfuscation (e.g. class/method/field/parameters etc.) and flow obfuscation. Decompiler can not show correct structure and code of the obfuscated assembly.

SWF Protect v1.6 can help you to Encrypt and Protect your Adobe Flash SWF Files from ActionScript Decompilers.
SWF Protect v1.6 Current version.
Movieclip Actionscript obfuscation.
Button Actionscript obfuscation.
SWF Protect v1.6 can defeat the sothink deompiler 3.4 and other decompiler tools.

{smartassembly} is a .NET software Improvement & Protection tool. It will obfuscate and protect your .NET software, optimize your .NET assembly for better deployment, minimize distribution size, increase performance & add powerful post-deployment debugging capabilities (with advanced unhandled exception reporting). {smartassembly} efficiently enables you to deliver a smart version of your .NET assembly, in no time and with unmatched ease.

Stunnix JavaScript Obfuscator is advanced professional obfuscator for .js/.html/.asp/.php/.wsc/.wsh files, with support for encoding and ensuring licensing condititions, with advanced GUI with Project Manager and ActiveX symbols extraction tool. It includes state-of-the-art support for ASP/PHP/SSI fragments embedded inside html code and in any place inside of JavaScript code and unique support for easy preparation of code for obfuscation.

Jasob JavaScript Obfuscator is the ultimate solution for JavaScript obfuscation! Protects your JavaScript code from stealing, significantly shrinks size and improves download time and execution speed. With Jasob your JavaScript code will become impossible to understand thus preventing anyone to steal and modify it. Its size will typically shrink for around 70% which will significantly improve download time and execution speed in the web browser.

Stunnix VBS-Obfus is an advanced professional obfuscator - tool for making
VBScript code inside .vbs/.html/.asp/.php/.wsc/.wsh files unreadable and
non-restorable, with advanced GUI (Project Manager) and ActiveX symbols
extraction tool.
It includes state-of-the-art support for ASP/PHP/SSI fragments embedded inside
html code and in any place inside of VBScript code and unique support for
easy preparation of code for obfuscation.

Professional approach to protecting, research, document and reverse engineering .Net assemblies!
Spices.Net - powerful tool for .Net developers that offers obfuscation, decompilation, analytical and documentation management features. Spices.Net is plugin environment that constantly renewing new possibilities.

Obfuscator is a tool to modify x86 assembler source code in this way to make an analysis of compiled code very difficult.

It is an unusual tool and the target audience is quite small, but if you're writing assembler code and you want to protect your work from decompilation or just to make it as hard as it's possible to analyze, you might want to try it.

Professional approach to protecting, research, document and reverse engineering .Net assemblies! Spices.Net - powerful tool for .Net developers that offers obfuscation, decompilation, analytical and documentation management features. Spices.Net is plugin environment that constantly renewing new possibilities.

SourceGuardian Encoder the ultimate protection solution for you to encode your PHP scripts. Now with full native bytecode encoding, time limiting scripts, IP and domain locking. The most comprehensive and user-friendly protection solution on the market.

Stunnix CXX-Obfus is cross-platform professional obfuscator -
tool for making
C/C++ code difficult to understand and rework (even after
use of code prettyprinters), with advanced GUI (Project Manager) and ActiveX
symbols
extraction tool.
It has unique support for all dialects of C/C++ and heavy use of preprocessor,
source compression mode, has a lot of means for
easy preparation of code for
obfuscation and other unique features.