I found a Java Paper server running on 1.21.11 and it has a zeppelin and warship kind of vibe.
It is pretty small right now with like 2 to 4 players most of the time and around 5 at peak so it feels chill and not crowded.
Bedrock players can join too using the port. Cracked players can also join and if you have a legit account you just do /premium accept.
The community seems friendly and there is a dynmao plus other nice stuff to use while you play.
