Common Plugins and their Wikis!

ModN Equine: A ModN-made plugin that is covered on other pages! /h panel and /h help!
Plot Panel: Another ModN-made plugin covered on other pages! /plot panel and /plot help!
mcMMO: This is the plugin gives you powers in your day to day minecraft experience. Examples include insta-chopping trees, temporary haste for mining, avoiding fall damage, and insta-replanting crops. Every time you do a basic task (such as mining a stone block) you get experience displayed in a bar at the top of your screen.
Wiki Page
Common mcMMO commands: 
/mcmmo help - lists all the commands for mcMMO
/mcstats - lists all mcMMO stats for every skill possible
/(skill here) - tells you all about that skill
/mctop (skill here) - shows you the leaderboard for that skill
List of mcMMO skills:
Gathering Skills
excavation
fishing
herbalism
mining
woodcutting
Combat Skills
Archery
Axes
Crossbows
Maces
Swords
Spears
Taming
Tridents
Unarmed
Misc Skills
Acrobatics
Alchemy
Repair
Salvage
Smelting