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I had the first 4 books and read them around ages 11-13, reading the first two before the first movie came out. I think because none of my classmates at the time had read or watched anything relating to HP, I never really talked about it, so I set it aside after finishing Goblet of Fire, which coincided with the Lord of the Rings movies.
To me, it felt like I was leaving behind a story for kids and getting in on the “real good stuff for adults”
BAR - Beyond All Reason, for Total Annihilation/Supreme Commander style RTS, learned about this one in another thread here on lemmy
Zero-K - similar premise, plays different from BAR, also the graphics seem less demanding
OpenSoldat - 2D arena shooter. For anyone that never played or saw something similar, think of multiplayer maps of halo, quake or unreal, but if it was a 2D platformer
Not quite open source, but Daggerfall Unity is a FOSS update to the engine for Daggerfall, a game which Bethesda has made free for years now. You can get the game off GOG, too.