GB Studio
A quick and easy to use drag and drop retro game creator
...The software supports multiple game types, including adventures, platformers, and role-playing games. Its event scripting system enables custom gameplay mechanics, variables, and branching interactions. GB Studio also includes tools for managing sprites, animations, backgrounds, and retro music. Available for Windows, macOS, and Linux, it can export playable ROM files, browser-based games, and builds for compatible hardware.