QuackedSMP is a survival server that feels mostly vanilla but it also has a required custom mod that adds ducks plus new drops and recipes. The server is made by a solo dev who is building a custom SMP plugin while people play so you get to be part of the first wave testing it.
The gameplay has land claiming to help keep builds safe and it has RPG style stuff like MCMMO type leveling and abilities. There is PvE survival for normal play and there is also a separate PvP arena if you want fights.
They also built anti grief detection and a chat filter so the rules are strict about no griefing or stealing and no cussing and no advertising. Backups run every 4 hours so the world is meant to stay protected. The server runs on version 1.21.8 and it also has a live 3D map you can check outside the game.
