Какие команды в игре Minecraft существуют? (Мультиплеер)

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al: created by Patrick_pk91.
alerter: created by Patrick_pk91.
altp: null
login: With this command a player can login! — Залогинится (/login пароль)
register: With this command you can change your password! — Зарегистрировать ник (/register пароль)
logout: With this command a player can logout! — Выйти из аккаунта
unregister: With this command you can delete your account! — Удалить аккаунт
authme: General command for Ops to control AuthMe!

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fly: fly — Полет… очень странный полет
afk: Marks you as away-from-keyboard.
antioch: A little surprise for operators
back: Teleports you to your location prior to tp/spawn/warp
backup: Runs the backup if configured
balance: States the current balance of a player.
balancetop: Gets the top x balance values. (max. 10)
ban: Bans a player. — Забанить
banip: Bans an IP address. — Забанить по IP
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broadcast: broadcasts a massage to the entire server.
bigtree: Spawn a big tree where you are looking.
burn: Set a player on fire.
clearinventory: Clear all items in you inventory.
compass: Describes your current bearing.
delhome: Removes a home. — Удалить ваше место спавна. Например если вы поспали у кровати
deljail: Removes a jail.
delwarp: Deletes the specified warp. — Удалить точку телепорта
depth: States current depth relative to sea level.
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eco: Manages the server economy.
essentials: Reloads essentials.
ext: Extinguish players.
fireball: Thorow a fireball
getpos: Get your current coordinates.
gc: Reports garbage collection info; useful to developers.
give: Enables you or the given player.
heal: heals toy or given player. — Вылечить
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help: Views a list of available commands. — Показывает доступные команды
helpop: Request help from online operators. — Показывает админов онлайн
home: Teleport to your home. — Телепортировать на вашу точку спавна
ignore: Ignore other players. — игнорировать игрока
info: Shows information set by the server owers.
invsee: See the inventory of other players.
item: Spawn an items. — спавнить предмет. ID или имя предмета.
jails: List all jails.
jump: Jumps to the nearest block in the line of sight. — Телепортироваться в направленную точку
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kick: Kicks a specified player with a reason. — Выкинуть игрока из сервера, можно указать причину, /kick игрок причина
kickall: Kicks all players off the server except the issuer. — Выкинуть всех с сервера
kit: Obtains the specified kit or views all available kits.
kill: Kills specified player. — Убить игрока
list: List all online players. — Жмем Tab и не паримся
lightning: The power of Thor. Strike at cursor or player — Ударить молнией в направленную точку
mail: Manages inter-player, intra-server mail.
me: Describes an action in the context of the player.
motd: motd: views the Massage Of the day.
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msg: Sends a private massage to the specified player.
mute: Mutes or unmutes a player.
nick: Change your nickname or that of another player. — Изменить свой ник
nuke: May death rain upon them.
pay: Pays another player from your balance
ping: Ping! — Вроде, показывает ваш пинг
powertool: Assigns a command to the item in hand, 9player0 will be replased by the name of the player that you click.
powertooltoggle: Enables or disables all current powertools
ptime: Adjust player's client time. Add @ prefix to fix.
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r: Quickly reply to the last player to messange you.
realname: Displays the username of a user based on nickname.
reloadall: reloads all plugins.
repair: Repairs the durability of all or one item.
rules: Views the server rules. — Показать правила сервера
seen: Shows the last logout time of a player
sell: Sells the item currently in your hand.
sethome: Set your home yo your current location. — Назначить для себя спавн
setjail: Creates a jail where you specified named [jailname]

И это не все+переведи

Много, почитай основные доступные на ванильном сервере:
http://zone-game.info/admin-commands-minecraft.html
И ещё дополнительные, доступные с плагинами если ты админ:
http://ru.minecraftwiki.net/WorldEdit
http://ru.minecraftwiki.net/CommandBook