Games and game-adjacent things on the spectrum between casual creators and generators.
Generation of things
Spore creature creator
https://www.youtube.com/watch?v=dRovPCiBBTw&ab_channel=Spore
Random Access Character
https://glkitty.itch.io/random-acess-character
Snowflakes
https://viviariums.com/projects/snowflake/interactive/
Spaceships
https://twitter.com/proc_spaceship
Moths
https://twitter.com/mothgenerator
Mansions
https://watabou.itch.io/procgen-mansion
Tanks
https://watabou.itch.io/tank-doodles
Avatars
It can be an avatar creator like a picrew
Examples 1 2 3 4 5 6 7 8 9
Other modular collages
Examples 1 2 3 4 5 6 7 8
Patterns
http://mycours.es/digitalmedia/project-pattern/
Generation of environments
Minecraft
Interactive explanation of various noise-based generation techniques
https://www.redblobgames.com/maps/terrain-from-noise/
No Man’s Sky
Dorfromantik
Dofromantik uses a much simple hexagonal tile based system similar to the board game Carcassonne. You can see the tiles abstracted here:
https://vilda.net/s/dorfromantik-solver/
Other examples
Planets
https://egordorichev.itch.io/planet-generator
Proteus
https://twistedtree.itch.io/proteus
Accurate Coastlines
https://spotline.itch.io/accurate-coastlines
Maps / towns
https://watabou.github.io/
4Ever Transit Authority
https://turnfollow.itch.io/4ever-transit-authority
Interiors
Mazes
https://en.wikipedia.org/wiki/Maze_generation_algorithm
https://t-rexwave.itch.io/hand-drawn-maze-generator
Rogue
Procedural random generation techniques for maps – from the conference Roguelike Celebration
Spelunky
Noita
Noita uses a variant of the Wang Tiles
https://en.wikipedia.org/wiki/Wang_tile
http://nothings.org/gamedev/herringbone/more_herringbone_tiles.html
https://thehorscht.github.io/NoitaWangTiler/
Generalized Wang tiled generator
https://www.boristhebrave.com/permanent/23/03/tileset-creator/
Marching squares/cubes
Wave Function Collapse
More technical and cutting edge technique. You can find a lot of information online and some interactive implementations:
https://lelserslasers.itch.io/wave-function-collapse-overlapping-model
Other examples
Brutalist architecture / exhibitions
https://www.youtube.com/watch?v=j–No48hcfs&ab_channel=AlphaBetaGamer
Interminal
https://www.youtube.com/watch?v=1TBtelRAglM&ab_channel=Sim4K
For more advanced examples, and a community check
https://www.reddit.com/r/proceduralgeneration/
Casual creators / sandbox
Townscraper
https://store.steampowered.com/app/1291340/Townscaper/
Playthrough
Engare
https://store.steampowered.com/app/415170/Engare/
Creative mode playthrough
https://www.youtube.com/watch?v=q3GqwTEP9yo&ab_channel=MahdiBahrami
SuperSculptor
https://shilly.itch.io/supersculptor
Become a Great Artist
Download, Playthrough
Panoramical
https://www.youtube.com/watch?v=iuPYVL6IYPI&ab_channel=FullThrough
Historic Tale construction Kit
https://htck.github.io/bayeux/#!/
https://mobile.twitter.com/profannieoakley/status/1357768408671027202
Blob Opera
https://artsandculture.google.com/experiment/blob-opera/AAHWrq360NcGbw?cp=e30
Blossom
https://kenwong.itch.io/blossom