Webnovel.Forum

Sure thing, the ones I read on Amazon in no particular order:

The Station Core - A novel about a person kidnapped to serve as intelligent control system for a defense network in alien star systems (apparently humans are very good at being violent with a purpose, who knew?) gets side-tracked by an attack on the ship transporting him and lands on a planet with primitives where he needs to protect his core, repair the damage caused by the crash landing and eventually build an economy capable of building a starship to get off that rock.

The Slime Dungeon Chronicles - a four book series dealing with a guy being reborn and building a dungeon, centered mostly around (le gasp) slimes. The series deals mostly with the interaction of dungeon and people, featuring some nice intrigue and perspectives of both the dungeon core and the adventurers visiting it.

Ancient Dreams - a 4 book series about a Dryad building a plant based dungeon under a mountain on the border between a kingdom of elves and a slaver empire looking to subjugate, sell and/or possibly defile all the hot elves.
It's a pretty good series, but it's mostly concerned with the human interactions and - be warned - some heavy lesbian leanings between the dryad and various battered elves she rescues more or less by accident.
Really liked the series despite the fact that the protagonist is mostly portrayed as very overpowered (sue me, I like it when the bad guys get beaten down hard :P).

Divine Dungeon - 3 books (4th coming out I think) about a Dungeon Core building a dungeon with a divine twist. It has some plot holes, but I enjoyed my time with it anyways.

Loki's Daughter the Opal Dungeon - first book in what I dearly hope will become a series. A soul is given a chance to become a dungeon and is snagged by Loki and friends to help him escape from his imprisonment (and possibly start the god smackdown early). Has a great twist in the book that I really enjoyed.

The Wizard (Dungeon Core 1) is a series of a wizard getting murdered due to a mistake and somehow escaping into becoming a dungeon under the spot that was once his wizard tower. Haven't read that one yet, but it's got three books in it and it looks promising.

Dark Dungeon 1: Dungeon Spawned is a pretty good dungeon book series with a definitive leaning towards the more saucy side, think harem. Not too wild about the smut, but I didn't let that dissuade me with Ancient Dreams when the book turned out to have a decent story and it didn't stop me here either.

Corrupt Dungeon: straight out smut with a dungeon core setting, literally about a sexual predator getting access to dungeon functions and various mind control mechanics to become a bigger (no pun intended) menace. Read the first book, wasn't really into it because it's really almost entirely set around the sex, including aphrodisiac plants, slimes that dissolve clothes and accost women and "zombie" plant people that do what slimes do but without the slime.
Fine if you're in the mood for it, but I didn't really care for it. No kink shaming, though. :P

As to RoyalRoad:

Not gonna go too into it here cuz it's free stuff and therefore you can just dive in and read it if you like.

• The Misplaced Dungeon - MC is a woman who's soul was copied by a lazy goddess to function as a controlling entity for a dungeon on her world. They wanted the dungeons to function as a cheap way to terraform the planet which has all sorts of issues because of said laziness, but OP went rogue and decided that instead of becoming a dungeon in the middle of nowhere she'd rather be a dungeon in the ocean.
  Hilarity ensues.

• City Dungeon - MC was a fan of Simcity and got struck by lightning, reincarnating as a dungeon. He decided he didn't wanna be a murderhole dungeon and set out to become a city dungeon, working with and protecting people to prosper together instead of harvesting from the corpses.

• The Dungeon of Evolution - MC was a badass mage who died from sort of mega disease and got chosen to make a new dungeon by some deity or other. Pretty slow start to it, but it's now reaching areas where it starts to get interesting (read: he's actually getting visitors!).

• The Realm Beneath - MC is actually a real dungeon, not some person reincarnated. Acts accordingly insofar as he's not torn about not murdering his visitors like most reincarnated MCs are. It's a fun read, but pretty short just like Dungeon of Evolution because they're both still updating.

• The Caring Dungeon - MC is a guy trapped in a dungeon core who wants to make a splendid forest dungeon. Not much to say about it, haven't read more than a chapter yet (damn games, why you gotta get released so closely together?!). Find out for yourself!

• Dungeon Heart - old dwarven master artisan dies in a mountain and finds himself becoming a Dungeon Core. Sets out to make a dungeon that's an artistic masterpiece, surprising virtually everybody. Still updating, meaty chapters, up to like 50 chapters now and one completed volume so a decent amount to read.

Aaaand that's it for now. I'm positive I've read more, but I can't find em on kindle (it doesn't show kindle unlimited books you read in your history very well) and the other ones on RoyalRoad are dead or discontinued. This list should keep you going for a while anyways.