You may know Essentials as Minecraft plugin but what is important here is its name: is includes all the commands that make your life easier.
Included at the moment:
/day, /night, /noon
/clear, /clear4all (the chat)
/help (lists all commands)
/pos (shows your position)
/set <block> (at your position)
/setblock <x> <y> <z> <block>
/tp <playername> OR <x> <y> <z> ... etc...
/fov <amount> (sets the field of view)
More commands will be following :)