This is a good starting point if you want to dive in.

Audio Books Bay (ABB) is good too.

Not sure, maybe “diagramming”. Btw there is a good alternative to draw.io for self-hosting called Excalidraw. Very easy to set up with docker.

Nice list! Btw draw.io is not optimized for mind maping. For mind maping I use Freeplane and realy like it.

YT plugin for Kodi is quite decent. Have it daily in use, no issues so far.

It’s trillan you are talking about. I am old too :D

Not as powerful as Tasker, but for some basic automation tasks PhoneProfilesPlus is a good alternative.

I bet soon more airlines will follow. Our cars are no different either. No much options left for traveling.

I love it so much that I put it right away on my donations list.

Have a link?

Using Argon NEO and quite like it. In my case it was important to have the ability to use a HAT (HiFiBerry).

You probably mean Radicale. Baikal is an option too.