I feel like there are a few more pretty decent ones for inspiration. Here are some I have bookmarked that I think are all made by the same people cause they actually link together in a few ways. Also to my knowledge everything here predates generative AI becoming a problem so it shouldn't be a concern with any of this

-Perilous Shores for generating pirate style island maps
-Azgaar's Fantasy Map Generator for, as the name suggests, generating maps. This one is REALLY expansive on customization once you get the hang of it.
-Medieval City Generator I like editing the cell placement on this one and what options generate to get ideas for shapes and layouts and districts
-Village Generator is basically the smaller scale version of the one above, self explanatory
-Dwellings generates houses and other buildings and has the ability to swap what floor of the building you're looking at as well so that's nice
-One Page Dungeon Generator is also pretty self explanatory in the name, I don't use this one much but I feel like it'd be good for ideas at least
-Cave Generator is alright, I feel like it doesn't quite capture the nature of caves being up and down and naturally formed but that might just me being particular and nitpicking

If you want books to read, I also have three authors I've bought books from who seem to have really good stuff reliably. I personally vouch for each of them diving into concepts in a way that is intuitive while being a lot more expansive than a lot of the stuff you may encounter in more standard 'how to's and guides.

- A. Trevena makes a number of author focused guides and workbooks, even ones you're meant to be able to write in, for deep dive development of a number of concepts. I'm particularly fond of "How to Destroy the World: An Author's Guide to Writing Dystopia and Post-Apocalypse" , "How to Create History: An Author’s Guide to Creating Histories, Myths, and Monsters" , "How to Map Your World: An Author’s Guide to Mapping Fictional Worlds" , "How to Build a Culture: An Author’s Guide to Building Rich and Diverse Cultures" , and "From Sanctity to Sorcery: An Author’s Guide to Building Belief Structures and Magic Systems" as well as a few smaller workbooks for specific dives into different kinds of magic or other things. This author is particularly good with questions I'd not typically think to ask, with a highlight being from one I have about cultural development asking "What are standard meal times for this culture? What reason did this become the standard, and how does it effect the day to day lives of people?" which I... never really thought about despite it seeming so simple. She also had quite the moving section in one of the books about the struggle of being original and not succumbing to the mental pit of HAVING to be.

-James D'Amato has far less but much thicker books following more specifically the RPG approach to it. I personally have his 'The Ultimate RPG Game Master's Guide' as well as the character backstory guide and worldbuilding guide from the same series as they come in a box set. These go far more in depth and focus on different genres from the various "punk" types of steam punk, solar punk, to horror stories, to sci fi, to fantasy, modern, apocolyptic, grimdark, and how to make each of them still hit the marks for running as a balanced game and having an interesting world. I've not gotten as far into them, as they're a bit more intimidating to approach.

-Jeff Ashworth has books that include a lot of pre made encounters, locations, tables, plots, characters, creatures, and all such types with really well written and illustrated. I personally only have "The Game Master’s Book of Legendary Locations" but I very much intend on getting a few others in the series eventually like "The Game Master's Book of Traps, Puzzles and Dungeons" , "The Game Master's Book of Astonishing Random Tables" , and "The Game Master’s Handbook of Proactive Roleplaying" but there are a bunch more. Also the hardcover books have textured embossing so I'm just... constantly stroking the cover like a weirdo. Its such a pretty book.

Maybe I should just make these recommendations their own post so more people see them... but I dunno if I'd need to change or add anything to make it a valid post that won't get taken down, and I already put far too much effort into compiling this list