FabricCraft is a survival SMP that sticks to real vanilla mechanics because it runs on Fabric. It is for players who want farms and redstone to work the normal way without weird nerfs.
The main world is semi anarchy with minimal rules. There are no land claims so players can raid and fight over stuff. There are also no world resets so everything stays and the history builds up over time.
You can run with a crew or make enemies or just trade and live quiet. Hacked clients and other advantage mods are not allowed. There is also a simple voice chat mod you can use.
There is a creative world too and it has no plot limits so people use it to test builds before doing them in survival. If you like speedrunning there is a manhunt mode you can play.

