Flat Assembler (Popularity: )
http://flatassembler.net/ A self-assembling open-source 80x86 assembler for DOS, Windows and Linux. It supports all 8086-80486/Pentium instructions with MMX, SSE, SSE2 and ...
MASM32 (Popularity: )
http://masm32.com/ A working development for 32-bit Microsoft assembler. It includes useful libraries, documentation and tutorials.
MadWizard.org (Popularity: )
http://www.madwizard.org/ Tutorials, downloads and links about programming assembly in windows, as well as a public snippet library.
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