https://github.com/FossifyOrg/Calendar - on f-droid, simple and gets the job done https://github.com/OmGodse/Notally - on f-droid, simple with no bloat
I nave always user Obsidianfor my notes (wich are mainly for D&D and personal project, not anything work or school related) and I'm extremely happy with it. It works completely offline, you can make CSS snippets yourself if you know how to, it's very customisable and you could even avoid making an account for the cloud sync using other tools (I use synchthing). It doesn't use LLMs in any way, it doesn't has any ADs and it's also free
Seconded obsidian + syncthing. My phone and my wife's phone sync the obsidian notes folder to each other. We have shopping/grocery lists. So when one of us thinks of something we put it on the list, and when one of us goes to the store we have a combined list. It's very nice.
I've been using Etar for years. Can't complain. Edit to add that it's an open source calendar app available on F-Droid.
I use the original Simple Calendar (now FOSS Calendar, I think), and Quillpad.
I'm using Markor for notes and it's ok though missing some stuff. I'd like it to support Org markup and git versioning.
Markor + syncthing works for notes.
I moved away from calendars and use tasks.org with due dates for all my events. That's android and can sync to multiple devices.
Same setup (☞ﾟヮﾟ)☞
I never hear much chatter about Markor, so it's nice seeing it mentioned on this thread.
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
In this community everyone is welcome to post links and discuss topics related to privacy.
much thanks to @gary_host_laptop for the logo design :)