flat assembler

Flatassembler.net has 3 URLs listed in 2 Dmoz categories.

Flat Assembler
A self-assembling open-source 80x86 assembler for DOS, Windows and Linux. It supports all 8086-80486/Pentium instructions with MMX, SSE, SSE2 and 3DNow! extensions, can produce output in binary, MZ, PE, COFF or ELF format.
http://flatassembler.net/
Top/Computers/Programming/Languages/Assembly/x86/Assemblers_and_Linkers

Fresh
Visual assembly language RAD IDE with built-in FASM assembler. Designed for easy development of big assembly written applications. Self-contained, Fresh is written in Fresh and is fully compatible with FlatAssembler (FASM).
http://fresh.flatassembler.net/
Top/Computers/Programming/Languages/Assembly/x86/Assemblers_and_Linkers

Flat Assembler: MenuetOS
Forum, many topics covered.
http://board.flatassembler.net/forum.php?f=12
Top/Computers/Software/Operating_Systems/Realtime/MenuetOS