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
Nothing wrong with WG Tunnel. Btw Wireguard is on the IzzyOnDroid Repo.
I usually put all the relevant travel data in my Joplin notebook. If the tickets are availible as .passkey files I manage them with PassAndroid. Transportr for public transportation. Wireguard if you need to access your home network via VPN.
I love it so much that I put it right away on my donations list.
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.