General

/whoall or /listall
Shows a list of the players currently online.
/who or /list
Shows a list of nearby players, players in your region, and your online friends.
/stuck
Teleports you to a nearby safe location.
/plotmessages
Toggles showing plot greeting and farewell messages.

Rent

/rent
Check how much your rent is and how many days are paid up.
/payrent ammount
Allows you to pay your rent.

Trading

/trade
Toggles trading on and off.
shift + right click on player
Allows you to request opening a trade menu with that player.

Employment

/hire player or /employ player
Hiring people gives them access to chests, trapdoors, levers, stone plates and stone buttons. You can be employed by as many people as you like.
People who are hired cannot build and they can only take stuff out of chests that can be thrown.
/fire player
Removes a hired person from your plot.

Communication

/tell player message
Sends a player a private message.
/reply message
Replies to a private message.
/chat
Toggles your chat on and off.
/tells
Toggles your private messages on and off.
/ignore
Ignores a player. You will no longer see that player's chat and they will not be able to private message you.
/unignore
Unignores a player.
ooc: message or ((message
Speak out of character.

Chat Channels

/join channel
Join one of the channels and immediately begin talking in that channel.
/leave channel
Leave a channel.
/listen channel
Listen to a channel without switching to talk in that channel.
/talk channel
Change the channel you are talking in.
/global
If you are not in global, join global and switch to talk in global. If you are in global, leave global.

Friends

/friend name
Adds a player to your friend list.
/unfriend name
Removes a player from your friend list.
/friends
Lists your friends.

Profile

/profile name
View/set character name.
/profile description
View/set character description.
If you put a player's name in [brackets] it will link to their profile.
If you put coordinates like [0,0] it will link to the map.
You can also start a new paragraph with two underscores: __.
You can append text using a plus sign +.
For example, /profile description +__ more text, will add a new paragraph to what ever is already in your description.
/profile background
View/set character background story.
If you put a player's name in [brackets] it will link to their profile.
If you put coordinates like [0,0] it will link to the map.
You can also start a new paragraph with two underscores: __.
You can append text using a plus sign +.
For example, /profile background +__ more text, will add a new paragraph to what ever is already in your background.
/profile oocinfo
View/set out-of-character info.
/profile twitter
View/set twitter account.
/profile twitch
View/set twitch account.
/profile youtube
View/set youtube account.
/profile reddit
View/set reddit account.
/whois [playername]
See another player's profile.