The SimpleASM named SASM is a simple open source cross-platform IDE for NASM, MASM, GAS, FASM assembly languages and is working with Windows and Linux.
I tested the Windows version 3.8.0 with FASM x64 example and is working well.
I tested one FASM files from my projects area and also working great.
You need to add the FASM folder into SASM folder and this just to include all libraries of FASM.
You can use the help page by pressing the F1 key.
Also, you need to check from Menu Page the Settings of your build project.
You can download it from here.
