I found a server called Warshipcraft and it runs on Java 1.21.x with Paper. It also has a Bedrock port so more people can join in.
It has a lot of plugins like a ridiculous amount. The developer is active and the owner has been running it for years since 2017 so it feels like it is not going to disappear.
The server is kind of niche and it is focused on warships and guns on an Earth style setup. The staff are older people and they try not to use admin powers in the main world unless it is really needed.
Earth Warships And Big Guns
CraftyCarCrafter Minecraft SMP
Yo, bro, if you’re looking for a sick Minecraft SMP to join, look no further than this epic server that’s so lit, it’ll make your brain explode with joy! We got creators on here who make vehicles that will blow your mind, just like Quiet Nerd does.Join our server and you’ll be riding around in a flying pig-powered rocket ship in no time, cruising through the skies like a boss. Plus, we have secret underground bases filled with treasure and traps that will keep you on your toes.
But wait, there’s more! Our server is also home to a legendary diamond-eating dragon that you can tame and ride into battle against other players. Trust me, you don’t want to miss out on this insanity. So come join us and let’s get weird together!