I have an Asus Eee PC from 2009 running Puppy Linux (as a secondary device).
As already pointed out you will need a leightweight distro and desktop environment.

https://distrochooser.de/ (available in English) can help you find the right distro, it takes into account the age of your device, your Linux knowledge, use case and a lot more.

My data is my data. Period. Or at least it should be.
Abuse of position as dominant provider of search engine (incl. censorship) and mobile OS.
Labour Practice.
e.g. https://en.m.wikipedia.org/wiki/Criticism_of_Google

Similiar reasons apply to Amazon, Apple, Meta, Microsoft, PayPal, X and so on since well before Trump & Co.

Appologies for my aggressive tone. I really hate these companies / their owners and what they are doing to our society, wellbeing, and humanness. It could have turned out so much different, if not for their greed and egoism!

That’s weird. At least for Linux and Android it was free, last time I checked.

It is free and open source. https://github.com/CollaboraOnline/online

Download via F-Droid needs additional repository: https://www.collaboraoffice.com/downloads/fdroid/repo/?fingerprint=573258C84E149B5F4D9299E7434B2B69A8410372921D4AE586BA91EC767892CC

“NOTE: main server is offline, you’ll see the message that you’ll add a mirror, that’s expected. To make it skip the main server, open repo details and toggle off first collaboraonline.com entry.” (https://forum.f-droid.org/t/known-repositories/721)

Source please.

https://github.com/YangDai2003/OpenNote-Compose
Though it might be lacking in terms of UX.