Rugland Packer for (.Net) eXecutables 1.3 | http://rpx.codeplex.com/
Compress .NET executables and pack multiple assemblies into a single executable bundle. It requires no additional external assembly or library to decompress so you get really good compression with only about a 7KB overhead. It's developed in C#.
.NETZ | http://madebits.com/netz/download.php
.NETZ comes as is without any express or implied warranty. In no event will the author be held liable for any damages arising from the use of this software.
You can use .NETZ out of the box free of charge and without any reference to its origin or author. .NETZ is an open source tool. You can modify its source code to fit your own needs, but you are not allowed to distribute your changes, or sell .NETZ modified versions.
The author can change the terms of this license at any time. The changes do not affect the applications already packed with .NETZ.
Exepack.NET | http://exepack.codeplex.com/
Exepack.NET is executable file compressor for .NET Framework. It allows to package your .NET application consisting of an executable file and several class libraries into single compact easy-to-deploy executable, protected against disassembling. Exepack.NET is developed in C#.
Just a little list i found googling. Last one is detected as virus infected by AVG FREE 2014 .
Do you know another working .NET assembly compressor?