rgbds —
Rednex Game Boy Development System
To get a working ROM image from a single assembly source file:
$ rgbasm -o bar.o foo.asm
$ rgblink -o baz.gb bar.o
$ rgbfix -v -p 0 baz.gb
 
  
  - 1997, Carsten Sørensen (AKA SurfSmurf) writes ASMotor as a
      general-purpose assembler/linker system for DOS/Win32.
 
  
  - 1999, Justin Lloyd (AKA Otaku no Zoku) adapts ASMotor to read and produce
      GBZ80 assembly/machine code, and releases this version as RGBDS.
 
  
  - 2009, Vegard Nossum adapts the code to be more UNIX-like and releases this
      version as rgbds-linux on GitHub.
 
  
  - 2010, Anthony J. Bentley forks that repository. The fork becomes the
      reference implementation of rgbds.
 
  
  - 2017, Bentley's repository is moved to a neutral name. It is now
      maintained by a number of contributors at
      https://github.com/rednex/rgbds.
 
  
  - 2018, codebase relicensed under the MIT license.