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.
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.
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.