Bukkit

WorldEdit is an in-game map editor for both creative and survival

WorldGuard

Stops people from breaking farmland

Grief Prevention

Open anyone's inventory as a chest in real time!

Toggle PvP for your players, stop combat log, protect newbies, stop border hopping and more!

LoginSecurity

CoreProtect

The most used authentication plugin for Spigot and CraftBukkit!

FastAsyncWorldEdit

Simple & Effective Staff Utility To Freeze Players! [Very Customizable] When player's give you lemons, freeze them & make Ice Lemon Tea!

Inexpensively protects your ores from cheaters.

Terrain creation ingame using 3D brushes

Uploads backups to Google Drive/OneDrive or by (S)FTP, now a lot easier to set up!

Protect and lock Chests, Furnaces, etc. with a easy to use GUI.

a feature-rich world size limiting plugin, which can also generate or trim a world to your border

Advanced /vanish plugin which makes other players think that you're not on the server

Detect and fight the exploitation of various flaws/bugs in Minecraft!

High-Performance Anti X-Ray plugin

Claim land of any shape, not just within a chunk