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Multiplayer commands that are aimed at players. You can get the player ID by using command players [More info] in console.

Command	Explanation
id <playername>	Prints the id of the player
kick <id>	Kicks the player out of the server
mute <id>	Mutes the player
unmute <id>	Unmutes the player
firework <id> <count>	Launches firework(s) on the player <count> times.
level <id> <level>	Teleports the player to a specific level.

More commands are listed:
Player list/id: [More info]
Player skin commands: [More info]
Server commands: [More info]
Multiplayer list, and server hosting: [More info]