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https://hardcodex.ru/ let’s you enter the spells you need and print little cards for those. That’s what I use for face-to-face games.
For VTT games, I used Fantasy Grounds with the core books, I just need to click on the spell to read it and cast it, and can drag them to my hotbar to instantly cast them from there like in an MMO. This option sadly is a lot pricier though, if you’ve already bought the books physical or for another VTT.
Wow! That’s a paperclip and a nickel long descent!