Assemblers                                    Assembly Compilers
     ========================================================================================
1977 ASM86                                                           ||
1978 |                                                               ||
1979 |-CP/M-86 asm86                                                 ||
1980 |                                                               ||
1981 +-------------------------------------------------+             ||
1982 |-MASM---------+----+                             |             ||
1983 | |            |    |                             |             ||
1984 | |-NBASM      |    +-------------------+-Incra   |             ||
1985 | |            |    |                   |         |             ||
1986 | |-ARROWSOFT  |    |                   |         +--A86        ||
1987 | |            |    |                   +-WASM       |          || Terse
1988 | |            |    +-OptASM                         |          ||
1989 TASM-----------)----)----------+                     |          ||
1990 |              |    |          |                     |          ||
1991 |              |    |          |          GAS        |          ||
1992 |              |    |          |                     |          ||
1993 |              |    |          |                     |          ||
1994 |       +------+    |          |  GEMA, CrossFire    |          ||
1995 |       |           +----------)------------------+  +-A386     ||
1996 |-------NASM         \-Pass32  |                  |             ||
1997 |-TMA   |-------------------+  |                  |-ML          ||
1998 |       |-SpASM---+         |  |                  |             ||
1999 |       |-GASM    |         |-FASM                |             || HLA
2000 +-LZASM |         |         |                     |             ||
2001 |       +-GoASM   |         +---------------YASM  |  Osimplay   ||
2002 |                 |                               |             ||
2003 +-miASMa          +-RosASM                        +-CodeX       ||
2004                                           Octasm                ||
     ========================================================================================

Some notes on the two categories:

1) Assembly language is any programming language with
   a 1:1 correspondance to machine code
2) Assemblers take assembly language and assemble it
   into object code (for use with a separate linker),
   raw machine code, or machine code with some form of
   header used to tell the OS how to load it
3) Assembly Compilers take assembly language, and compile
   it to an intermediate form that is then assembled by
   an assembler