AsmHighlight - Extension for Visual Studio .NET, .NET 2003, 2005 and 2008 that provides highlighting for inline assembly in C and C++ source files and for assembly code in the Disassembly window of Visual Studio.
 

Screenshot

Download v1.0.0
CodeSize - Addin for the RadASM integrated development environment addressed to developers writing code for the FASM or MASM assemblers. It allows viewing the size that individual lines of code will be assembled to. Multiple lines can be collapsed inside the IDE for viewing the size of various code portions.
  Screenshot - FASM

Screenshot - MASM

Download v1.1.4
MsgParam - Addin for the RadASM integrated development environment addressed to developers writing applications using the Win32 API. It displays information about the wParam and lParam parameters of message-dispatching functions, as well as providing
autocomplete for constant values of the two parameters.
  Screenshot Download v1.0.2