Disassemblers and Decompilers List
ILDasm
http://www.microsoft.com/downloads/details.aspx?FamilyID=9b3a2ca6-3647-4070-9f41-a333c6b9181d&displaylang=en
Written by Microsoft
Cost: $0
Monodis
http://www.mono-project.com/Downloads
Written by mono
Cost $0
DILE – Dotnet IL Editor
http://sourceforge.net/projects/dile
Written by Petrény Zsolt
Cost: $0
Reflector for .Net
http://www.aisto.com/roeder/dotnet/
Written by Lutz Roeder
Cost: $0
Asmex – Free-source .Net Assembly Examiner
http://www.jbrowse.com/products/asmex/
Written by Ben Peterson
Cost: $0
Dis# - .Net decompiler
http://www.netdecompiler.com/
Written by NETdecompiler.com
Cost: ~$345
.Net Explorer
http://www.remotesoft.com/dotexplorer/
Written by Remotesoft
Cost: ~$1,099
Spices.Net
http://www.9rays.net/cgi-bin/components.cgi?act=1&cid=86
Written by 9rays.net
Cost: ~$693