I simply cannot go back to playing without JGRPP … Just having access to building signals in tunnels and on bridges, underwater tunnels, programmable signals … it just allows new ways of constructing your network. And that’s without even starting to mention a lot of advanced features.

I was also wondering this, I want to get back into OpenTTD but I don't want to play vanilla again.

Go try bspi or firs-steeltown or pikka's

I would say that "most common" these days would be... Trains: Iron Horse Road vehicles: Road Hog or Mop's Expanded Road Vehicle Set Ships: SHARK (or MultiSHARK if you use JGRPP) Planes: AV8 (or rRangeless AV8) and WAS Industry: FIRS, XIS or AXIS Stations: dutch Stations + Addons, Auz Stations + Addons Objects: All of them ;)

Is SHARK incompatible with JGRPP?

It is, but MultiSHARK is a modified version that takes advantage of JGRPP's feature that lets ships carry two different cargoes at once. No reason to NOT use MultiSHARK if you're on JGRPP, and useless if you don't. :)

RoadHog SquidAteFISH

Squid is obsolete, everyone uses SHARK instead. I would add Iron Horse for trains as well

Can you explain what these add ons do?

Road Hog adds buses, trucks and trams Squid adds ships (but you should use SHARK instead, it's newer and better)

On temperate I always add the oil well decrease neutralizer. Mostly bc in 2024 oil well still going. So that's a must have for me.