On Linux there’s https://github.com/tesseract-ocr/tesseract, which is FOSS. There’s several Android apps on f-droid that use it:

• https://f-droid.org/en/packages/org.totschnig.ocr.tesseract/
• https://f-droid.org/en/packages/io.github.subhamtyagi.ocr/

In case anyone’s still checking here for recommendations, here’s a few more reasonably active communities:

• !loops@midwest.social: fun or interesting loops (i.e. TikTok/Reels/etc but better)
• !moomin@sopuli.xyz: Come see the cute characters created by Tove Jansson
• !internetisawesome@sh.itjust.works: celebrating fun and cool sites across the web
• !insanepeoplefacebook@lemmy.world: when you want to feel well-adjusted and normal, look at crazy people’s social media posts
• !cyanideandhappiness@lemm.ee: for the webcomic Cyanide & Happiness
• !thefarside@sh.itjust.works: for the comic The Far Side that we all know and love
• !curatedtumblr@sh.itjust.works: the best that tumblr has to offer
• !cartographyanarchy@lemm.ee: for cartographers with nothing left to lose
• !calculators@midwest.social: for nerding out about those handy devices
• !mealtimevideos@lemmy.cafe: Not too short, not too long. Videos to last through your meal.
• !xkcd@lemmy.world: A community for a webcomic of romance, sarcasm, math, and language
• !artporn@lemm.ee: Look at some nice classic art
• !twosentencehorror@sh.itjust.works: Read the title, then read the twist
• !ancientinternet@lemmy.world: Memes from the days of yore
• !stable_diffusion_art@lemmy.dbzer0.com: See cool art created by AI
• !shortstories@literature.cafe: Cozy corner for short stories
• !science_memes@mander.xyz: A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab
• !sillynsfwart@lemmynsfw.com: Because sometimes lewd and funny go hand in hand

Done, thanks for the suggestion!

We’ve got !AskUSA@discuss.online for casual conversation about the US. You’ll likely get more opinions there than straight science, though