The core rules of d&d (mechanics but not settings) are available under a free license (it was the Open Gaming License, or OGL, although I have a feeling it’s a different license (Creative Commons , maybe?) now following the backlash from earlier this year when Wizards tried to scrap the OGL and replace it with a worse license)

Pathfinder was originally based on the d&d 3.5e ruleset. I’m not sure how far it has diverged from that, as I’ve played neither. Solasta is based on d&d 5e (the latest version of the rules), but is in a non-d&d setting of their own creation. BG3 is also based on 5e (although less strictly than Solasta), but also has the D&D license, so can use the Forgotten Realms/Sword Coast setting.

If you read the article (or even the text in the post), it’s mostly about letting app developers test that the update doesn’t break their apps, and giving them time to fix things before the full release. Sure, some people will want to try out the new features ahead of time (and potentially report bugs to Google), but that’s only part of why they release betas.

Yeah. Probably not actually my favourite at the moment, but definitely the game I’ve sunk the most amount of hours into.

You’re undead, and use magic and guns to fight aliens and gods in defence of a big ball. The big bad is made of ghosts (but not the kind you’re friends with).