My own own, capable of handling the 65(C)02, 65816, Gideons 65GZ032 and the Z80. The last one because the Commodore 128 has both a 8502 and Z80 onboard.
What I especially like about it: it is free!

Interested? See: http://www.baltissen.org/mp_assem.htm

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Like Memblers, I also use the CC65 Assembler. I really like the relocatable code support and memory segment support of it so I can write modules and not have to worry about addressing until "Link - Time"

It is nice that cc65 supports so many targets (15 or 16), including Apple II, Comadore, Atari, Amiga, NES, and others. I am in the process of modifying one of the existing traget defineitions to meet my specific needs.

It is open source and runs under Linux, Windows, other uincies and Mac OS X.

I had some difficulites getting cc65 up under Mac OS X, but it was mostly my misunderstandings and inexperience with Unix applicaitons.

CC65 supports 6502, 65C02 and 65816 and I am Looking forward to being able to do projects in both assembler and C.

Later,

Andy

DASM

http://www.atari2600.org/DASM/

I prefer to assemble by hand. I like to do it the way Woz did for the
Apple ][ ROMs.

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Sam

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"OK, let's see, A0 on the 6502 goes to the ROM. Now where was that reset vector?"

> I prefer to assemble by hand. I like to do it the way Woz did for the

I started out that way and gained a great benefit from it. Don't stop there though-- you'll sell yourself short. You don't lose any control with an assembler, including with conditional assembly, macros, and other things that make assembly a lot more powerful. Even in Forth (unlike other high-level languages with their black-box compilers), you can predict exactly what bytes will be compiled if you want to go through the motions by hand. No control is lost.