It’s not strictly privacy-focused but The Goblin’s Notebook is designed exactly for your use-case. It has markdown, object connections, every object has a player visible setting, so your players can access known content while you keep secrets hidden. There’s a free tier, a mid tier at $1.50 and an unlimited tier at $3 dollars a month (managed via their patreon).
I also have been using podcast addict, probably for over 10 years now. You can autodownload new episodes (mine checks daily at 7a and 7p), create custom playlists for juggling multiple podcasts at once, has android auto support, and you don’t have to deal with the bs of Spotify.
I’m sure there are a 100 other features I don’t know about, but that’s what I use.
We’ve a gnome wizard in our party who focuses on fire magic. Our last combat involved the DM rolling out small groups of minions each round. They were coming out of an airship and stayed grouped up. You bet your ass that gnome spent 3 turns in a row casting 3 fireballs.
Tiered DC. I don’t know if 5th has that as an official rule or it’s a common house rule.
Rolling to seduce a dragon? Nat 20: he/she laughs at you, you fail. Nat 2: does a 22 hit your AC?
Ahh yes, the 3 major fantasy races: elf, dwarf, and necromancer.