ArmDot - Protect .Net code, software licensing tool for .Net
Dotfuscator - Post-build .NET hardening and instrumentation platform for protecting, measuring and managing .
.Net Anti-Decompiler - This protect .net assemblies from reverse engineering. It provides an extra layer of protection.
Crypto Obfuscator For .Net - Crypto Obfuscator For .
Confuser - An archive of the CodePlex open source hosting site
Aldaray Rummage - Rummage obfuscates .NET programs to prevent decompilation, re-use, stealing and hacking.