So, in an effort to get the thread back to the topic, or at least back to being productive and useful, here's some resources to use...
Azgaar's Maps. Randomly generate a map of various types sizes, etc. Includes terrain, "realistic" biomes, place names, settlements, "natural" rivers, towns, settlements, army sizes, etc. There's a lot of information randomly generated for a map. Almost anything you'd need.
Donjon. Lots and lots of random generators. Fantasy names of various types, planet generators, dungeon generators, job generators, NPC generators, etc. That's of great stuff to use.
5E DMG. Yep, the DMG is actually useful...who knew. There are random generators therein. Dungeons, NPCs, etc. Not the most robust, but still useful. The NPC charts alone can generate about 12 billion NPCs. And they don't include things like race, class, background, and/or occupation, so including those as parameters will get you a lot more possibilities.
Older DMGs. Yep, old books are still useful...who knew. The 1E DMG has a lot of great random charts and/or content you can drop into a random chart, as does the 2E DMG.
Worlds Without Number and Stars Without Number. These books are
the best resources I've found for generating sandbox content. Worlds is more for generating a fantasy world whereas Stars is more for generating sci-fi worlds and sectors of space, though both can be useful...especially now that Spelljammer is official again. Worlds includes generators for: terrain features, nations, people, societies, governments, temples, malevolent cults, points of interest, ruins, etc. It also has a few dozen sets of 50 tags that you can combine in various ways to spark your imagination. It has tags for: ruins, wilderness, communities, courts (factions), etc. Types of ruined sites. Rooms of interest within ruined sites. Various generators for the inhabitants of ruins, etc. Generators for encounter goals, mood of the encountered, wilderness and dungeon events. On and on and on. These really are
the best resources you can find right now.