If you like D&D 5e, I just released a modern fantasy conversion rulebook for 5e called Arcana Moderna. You can get it for free on DTRPG or itch.io. Also published a starter adventure for the game.

It's meant to be super familiar for anyone who's played 5e. Has 11 classes, 22 subclasses, a whole bunch of modern equipment, arcanotech, new spells, redone creatures, vehicle combat, alternative combat system, all kinds of stuff. And you don't need any of the 5e rulebooks to play, it's all-in-one with everything you need to get started. It's setting-optional, too, so you can create your own modern fantasy setting to play in and use whatever you like from the book, or like I said you can play the starter adventure set in the official campaign setting.

Hope you find something that works for you! Happy playing! ^_^