These are the plugins an owner installs first and never removes. They provide the command set vanilla lacks, let you edit configuration in game instead of over SSH, schedule restarts and backups, broadcast notices, manage the whitelist and inspect what the server is doing right now. Several bundle dozens of small administrative commands into one essentials-style plugin, which is why so many setups start with exactly one dependency.
Better Ban Plugin
Better Jails Plugin
BetterGUI Plugin
Bridgekeeper Protocol Plugin
Chronos Backups Plugin
Crafters Staff Plugin
Dash Dashboard Plugin
Donut Orders Plugin
Dynmap 9minecraft Plugin
Dynmap Plugin
Essentials 9minecraft Plugin
Essentials C Plugin
Event Forge Plugin
Event Sounds Plugin
Guestpath Secure Bridge Plugin
Inventory Swap Plugin
InvSee++ Plugin
Lazarus Trace Plugin
Loop Commands Plugin
Maria Craft Plugin
MarriagePlus Plugin
Mclogs Mclo.gs Plugin
Mclogs Plugin
My Command Plugin
Omnigrid Mirror Plugin
Player Manager Plugin
PvP Manager 9minecraft Plugin
Skript Plugin
SuperVanish Plugin
TAB Plugin
Ultimate Head Finder Plugin
Vivid Stream Control Plugin
WG GUI Plugin
World Guard Plugin
World Guard Region Protect Plugin
WorldGuard Plugin