Bukkit

The premier long-range map editing tool for Minecraft SMP.

PlotSquared

kAntiXray - Get rid of XRay hacks!

Automatically have player ranks change depending on how long they have been online.

Detect and Fight the exploitation of various Flaws/Bugs in Minecraft

Track PVP kills, ready for webstats with MySQL!

Schedule configurable server wide broadcasts easily

SideKick

Makes combat work like before 1.9, with no weapon cooldown etc.

The best-rated server backup plugin with cloud upload! Works with Google Drive/OneDrive/Dropbox/FTP/WebDav with super simple setup.

AdvancedRegionMarket (ARM) allows you to sell, rent and manage WorldGuard regions

Rank-based permission manager

copy player inventory on MySQL

Every Message Under Your Control!

Disguise as any mob in minecraft!

Adds magical runes to the game for Teleportation, Construction, and Combat

Scriptable, interactive citizens.

Separate inventories for Creative and Survival game modes

AdminFun is an essential plugin needed for servers to let your admins have fun!

VT or Skript like plugin allow you from shallow functionality to deep access to the server itself.