Academagia [official site] originally came out seven years ago, when Kieron ‘Funny Pages’ Gillen described it as “a scarily deep Princess Maker with Wizards”. It’s a Hogwarts simulator, in which you play the role of one of the new kids at a school for magical sorts, and have to go to classes, learn magicks and other things, make friends (and enemies), and involve yourself in plots and adventures. Primarily text-based, it’s a massive, complex life sim in which character creation is so baffling and time-consuming that I’ve never actually started the game.
Maybe now is the time. The “definitive” version is on Steam, bringing an interface overhaul, all existing DLC, and plenty of bugfixes.