Bueno aca les dejo una lista de las tools que he encontrado en la red para hacer reversing/decompiling/disassembler/patching/deobfuscation de aplicaciones .net. :o
(http://cdn.alternativeto.net/i/640b00ad-d501-df11-8cae-0022190f5762_370.png) .NET Reflector http://www.red-gate.com/products/dotnet-development/reflector/ (http://www.red-gate.com/products/dotnet-development/reflector/) - de pago - trial
(http://img.informer.com/icons/png/48/68/68540.png) Dis# http://www.netdecompiler.com/index.html (http://www.netdecompiler.com/index.html) Pago - trial
(http://www-ru.softsalad.com/icons/003/spices-net-suite.png) Spices.Net www.9rays.net/Category/53-spicesnet-suite.aspx (http://www.9rays.net/Category/53-spicesnet-suite.aspx) Pago - trial
(http://images.giveawayoftheday.com/icons/png/32/2355/2355741.png) Salamander .NET Decompiler http://www.remotesoft.com/salamander/index.html (http://www.remotesoft.com/salamander/index.html) Pago - demo online
(https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcQXyM-xAGdP-uwsXBovObhL5E-w_6dMYWtPRDdE3xUlDvKwg-oyWQ) .NET CodeReflect http://www.devextras.com/decompiler/ (http://www.devextras.com/decompiler/) Free
(https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcRwjDfhRpgEVpWcxegfuQYuavYQXKbP8-2GOAmaUPVJjWJAGBTZtQ) Monodis http://www.go-mono.com/mono-downloads/download.html (http://www.go-mono.com/mono-downloads/download.html) Open Source
(http://cdn.alternativeto.net/i/c00242ce-3b50-e011-8637-0200d897d049_16143.png) ILSpy http://ilspy.net/ (http://ilspy.net/) Open Source
(http://cdn.alternativeto.net/i/80362a32-757c-e011-9f53-0200d897d049_10700.png) dotPeek http://www.jetbrains.com/decompiler/ (http://www.jetbrains.com/decompiler/) Free
(http://cdn.alternativeto.net/i/72d30303-d571-e011-8d8d-0200d897d049_10628.png) Just Decompile http://www.telerik.com/justdecompile.aspx (http://www.telerik.com/justdecompile.aspx) Free
(http://cdn.alternativeto.net/i/33d49132-4d17-e111-972b-0025902c7e73_14607.png) Explorer Suite http://www.ntcore.com/exsuite.php (http://www.ntcore.com/exsuite.php) Free
(https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTLMiUtrRChKqOFezX-UA9-umul4cloC5ftpJ0dAEjaCTT25QCD) Dotnet IL Editor http://sourceforge.net/projects/dile/ (http://sourceforge.net/projects/dile/) Free
(http://cdn.alternativeto.net/i/bf63b31a-bfc6-e111-bcba-0025902c7e73_18728.png) ShowMyCode http://www.showmycode.com/ (http://www.showmycode.com/) Free Online
(http://cdn.alternativeto.net/i/53491da4-91de-e011-9743-0025902c7e73_13366.png) GrayWolf http://digitalbodyguard.com/GrayWolf.html (http://digitalbodyguard.com/GrayWolf.html) Free
(https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcShGb5NUsHKxshKIa5uRcCI2LjnFmvSQWQW82mxDRgNKrxK_wXw) NetDasm http://www.codeproject.com/Articles/19016/NetDasm-A-tool-to-disassemble-and-patch-NET-assemb (http://www.codeproject.com/Articles/19016/NetDasm-A-tool-to-disassemble-and-patch-NET-assemb) Open Source
(http://cdn.alternativeto.net/i/753f3c9d-8257-df11-82d2-0022190f5762_2933.png) Zeta Resource Editor http://www.zeta-resource-editor.com/index.html (http://www.zeta-resource-editor.com/index.html) Free
(https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTm-XpbNPxBGI4SbaoG0Z27mgYlMYVSpuGgOCWWol8qoxPaqbOX) MSIL Disassembler (Ildasm.exe) http://www.microsoft.com/en-us/download/details.aspx?id=8279 (http://www.microsoft.com/en-us/download/details.aspx?id=8279) Free - Tambien viene instalado por defecto con Visual Studio
He probado algunos pero personalmente me quedo con GrayWolf, como reemplazo al .reflector que es de pago :'( y aparte tiene un bonito DarkCode ;D
:-X Excelente aporte.
Saludos ;D