OpenTTD
The most active unofficial successor to r/OpenTTD!
...which is admittedly not saying much. We do require you to speak english when posting though but only for practicality, as long as you explain in english as well, you may post in any language you wish! It's just going to be easier for everyone that way. See also the german OpenTTD fediverse community for potential threads in german.
Please do not ask where to get NewGRFs, they are easily obtainable via the in-game content downloader (a.k.a "BaNaNaS" or "the fruit store") or TT-Forums and certain authors have expressed they will not allow downloads of graphics that they no longer provide support for by penalty of copyright law. The other side of the coin is otherwise explained in our "rules" thread. Please read the rules thread before posting or do not post.
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The "core game" is, oddly enough, obsolete. The main "mod" you'll want is a Patch Pack, specifically JGR's Patch Pack: https://github.com/JGRennison/OpenTTD-patches/releases
Don't worry too much about "OpenTTD-patches", this isn't just one patch like the ones where you'd have to compile patches into a nightly version yourself and all that crap. JGRPP is pre-compiled and is basically THE new standard version for anyone who knows it exists, as it's regularly being updated with new features and not just bug fixes yet you can turn off nearly any feature that gets added.
JGR's a pretty cool guy as long as your reasonable with him, unlike certain other members of the community-
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Oops!
myself, once upon a timeSorry...
OzTransGot something bugging my throat, I can barely speak!
SilverSurferZzZ-as I was saying, other than that you'll want to look for a list of currently-maintained AI scripts ("NoAI", which just means that the original TTD AI was gutted and replaced by interchangable AIs), as well as maybe pick a game script (GS), and make sure to pick up the following as "modded content" (NewGRFs, or GRFs for short)...