What is GNOME Recipes?
The main objects of interest are
The design can be found here: https://wiki.gnome.org/Design/Apps/Recipes
Other information and screen captures can be found here: https://wiki.gnome.org/Apps/Recipes
Source code can be found at https://github.com/matthiasclasen/gr. Linux version can be installed via Flatpak. Mac version can be installed via Homebrew.
GNOME Recipes Screenshots
GNOME Recipes information