Using Knowledge to their advantage

Guy wakes up in a game he's been playing. He's reset to level one but he's still really powerful, briefly invents stuff. So far only 11chpts

Not so much that she invents. But she does have a power to grab things out of a personal pharmacy with her being ex-military. The story is really cool thought if you're into revenge.

Woman dies when all her books fall on her. Get's reincarnated into medieval era where books are almost exclusively for the rich and literacy rates are super low. She makes it her mission to become a librarian in this era. It's starting to get good with suggestions that she might be a magic wielder.

Not so much that he uses modern tech but he implements teachings and tech from his past life. It's a pretty good read

Guy get's reborn as a Dungeon Master, So far he's only learning the ropes from another Dungeon Master. Then get's introduced to a lot of other Dungeon Masters. He uses Guns it's dope

His house was right above a huge source of power so he and the house are OP. He get's transported to another world with his house. So far he hasn't really left the area he was summoned to so not much going on.

Guy get's transferred from a First Person Shooter type of game into a Fantasy type of world. He is super OP with a ton of guns. It's pretty good

Guy lived a horrible life because god thought it would be fun to put someone through that when he dies three gods from a different universe give him a new life where he's really powerful in an attempt to make up for what the other did. Not so much that he makes modern tech but he uses the things available to him in unconventional ways.

Guy get's selected by a powerful magician to carry on their legacy. OP magic and with knowledge of the modern world he is able to make a bunch of cool things.

He get's summoned to be the husband of some queen because he has strong blood ties and can help keep a certain type of magic going since his grandparents were from that world. He gets to bring a bunch of stuff with him to that world. but he isn't seen using it much. If you like isekai and fanservice it's aight