I like the plain HTML in early-90s styling - very simple and functional. That is a lot of different architectures... but x86 is not included.<p>Also noticed that the complete package is 24MB+ because it contains not only the source but the binaries for all the assemblers compiled with all the compilers they used: cygwin, djgpp, linux, symantec, turboc30, vc6, vs05, vs10, vs13, watcom. I'm not sure what the point of doing this is (since the platforms are DOS, Linux, and Windows), besides as a comparison: cygwin appears to make the smallest executables, while vs13's is over 2x bigger.
I've recently been working on an assembler that has ASxxxx syntax compatability, but doesn't keep any of the other choices ASxxxx has made. It has definitely not aged well.