Protector Redo
TenPlus1

Lets players craft special blocks to protect their builds or disable PVP in areas.

Protector Redux
sorcerykid

An efficient and flexible node-based protection scheme for multiplayer worlds

Traders
Sokomine

Configurable mobs/NPC which can trade for you.

Ghost Block
Blocky Player

Adds blocks that you can walk through. Build traps, hidden rooms and more!

TP Gate
AiTechEye

Teleport through the gate

Global Bulletin Boards
FaceDeer

Allows creation of global bulletin boards where players can post public messages

Smart Renting
AiTechEye

Smart renting: Rent out your locked things and earn money!