FASM, or Flat Assembler, is similar MASM and NASM. Like MASM, it has its own source editor. Like NASM, the sections are easily identifiable and configured, and the software comes in flavors for both Windows and Linux:

FASM can be downloaded from http://flatassembler.net/.

In our assembly language programming, we will use FASM, since we can use its editor in both Windows and Linux.