Arcade Game Studio is now Freeware. You can download the gamemaker for free, and you can make donations at the Author Site.
ARGS is a program tool for making games with the style and gameplay of the 80’s arcade games. Includes genres such as Run’n’Gun, vertical and horizontal Shooters or Platform games, you will be able to make similar games to Pac-Man, Commando, 1942, Ghosts ‘n’ Goblins or Gauntlet, all with your own sprite sheets, pixel art, sound effects and music.
link is not working, thank you
Link Fixed.