Iczelion's classic site with source code, examples, tutorials and reference material.
Randy Hyde's main site that hosts the HLA project and the classic Art Of Assembler.
Thomas Bleeker's site with tutorials and a popular snippets collection.
Mark Larson's leading edge optimisation page.
Ketil Olsen's RadAsm site for current downloads of RadAsm and support.
Ewayne Wagner's AsmEdit site for downloads and AsmEdit accessories.
Ron Thomas's home site with examples in graphics coding.
Agner Fog's homesite for his popular optimisation manual and random algorithms in MASM.
Pelle's C compiler with MASM support and an excellent range of tools.