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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I really need to get better at using this.