Tinkers Tavern is an 18 plus Minecraft community that has been running for around two years and it feels really stable and relaxed.
The main world is a Vanilla plus SMP on version 1.21.10. It keeps the normal Minecraft feel but has helpful stuff like voice chat discord connection chunk claiming a map and small perks like limited random teleport for new players. You can join on a normal vanilla client and you do not have to install mods if you do not want to.
They also run a bunch of modded servers. There are two different Vault Hunters experiences including Wolds Vaults with a fresh season and new world. There is a Cobblemon server with another season planned plus a copy of HermitCraft Season 10 that you can explore. They even have an FTB Stoneblock 4 server for people who like skyblock style mining worlds.
The community is adults only but it is not a wild NSFW place. It is just for grown players who want low stress gaming and like survival style servers. People join from all over the world so there is usually someone online at any time.
Overall it looks like a friendly mixed server for casual players and sweaty grinders who want long term worlds and a small but active group.
