{smartassembly}
- A software improvement and protection tool. It will try to optimize the .NET assembly, obfuscate/protect development work, reduce distribution size, increase performance and add post-deployment debugging capabilities.
- http://www.smartassembly.com/

Skater .NET Obfuscator
- An obfuscation tool for .NET code protection.
- http://www.rustemsoft.com/Skater.htm

Dotfuscator
- Obfuscates to enhance source code security, shrinks to improve efficiency, and watermarks to track the origin of a pirated copy. [Commercial]
- http://www.preemptive.com/products/dotfuscator/

Eziriz NET Reactor
- Protect .NET applications from reverse engineering by merging any .NET application with native machine code.
- http://www.eziriz.com

Mangler
- A simple .NET assembly obfuscator application written in managed code and running right in browser. Includes an assembly explorer / IL disassembler.
- http://www.dotnetthis.com/Samples/Mangler.htm

Thinstall
- .NET encryptor, compressor, and pre-run framework checker. [Commercial]
- http://thinstall.com/dotnet/

Aspose.Obfuscator
- A .Net assembly obfuscating tool. [Shareware]
- http://www.aspose.com/Products/Aspose.Obfuscator/

Codework Dotfuscator
- A Microsoft .NET and dotnet obfuscator that prevents decompilation and reverse engineering dotnet software.
- http://www.codework.com/dotfus/product.html

Spices.Net (ex-ILO)
- Protect .Net assemblies from reverse engineering, with size reduction and speed optimizations. By 9rays.net. [Commercial]
- http://www.9rays.net/cgi-bin/components.cgi?act=1&cid=86

LSW IL-Obfuscator
- Obfuscates .NET assemblies
- http://www.lesser-software.com/ilobf.htm

Salamander
- A decompiler for .NET applications and an obfuscator to hinder decompilation
- http://www.remotesoft.com/

Demeanor
- An obfuscator for .NET applications to hinder decompilation
- http://www.wiseowl.com/