I STRONGLY back the recommendations for ebooks, music, & movies though I *really* wish I could add more to the latter. Especially since "streaming" doesn't have aesthetic of a gift!
Here's my recommendations for audio shows & too few movies: https://adrian.geek.nz/movies
Man From Earth could be good for any sciency-types you know.
Their RNG dongle & VPN box recommendations could be great gifts for the right person.
I like their help-wanted section. I know Pine64 is worth watching there.
For people who care about, support, or build Free, Libre, and Open Source Software (FLOSS).