1-Interacting With Your Mouse :
/title (number) : Lists off all of the titles you have earned if no number included. If you include a number that corresponds to a title you own, your title will switch to that title. EX :
/mort : Kills your mouse (give a +1 to score).

2-Changing Rooms:

/room [roomname]
/bootcamp :Changes to a random bootcamp room, or specified room (ex: /bootcamp1)
/vanilla :Changes to a random vanilla room, or specified room (ex: /vanilla1)
/survivor :Changes to a random survivor room, or specified room (ex: /survivor3)
/racing :Changes to a random racing room, or specified room (ex: /racing3)
/defilante :Changes to a random defilante room, or specified room (ex: /defilante3)
/editor :Sends you to the the map editor.
/totem :Sends you to the totem editor. (You need to have at least 1000 saves to be able to go to the totem editor)
/mulodrome :Starts a team-based racing map (max 10 mice). Can only be done in a private room you created (no one in it before you).

/tutorial :Sends you to "[Tutorial] YourNameHere"
/x_eneko :Sends you to your training room [your username
/salonauto [first word of the room's name] : Sends you to a room beginning with the word shown followed by a random number

3-Room related commands:

/pw [password] : Allows a player to set a password for the private room they created (no one in it before you), only enabling people who know
the password to enter. ex: /pw Hmiida. You can disable it with retyping /pw
/menu :Opens up the picture menu.
/module :lists "official" minigames that are available.

4-Interacting With Others:

/c or /w [username] [message] : Allows you to message another player privately.
/friend [username] : Adds the user to your friends list.
/ignore [username] : Adds the user to your ignore list.
/chat :Creates / joins a chat room.
/who :Displays the list of players in your current chat room.
/profile [username] :Open the user's profile (they need to be online for it to work).
/mute [username] :lets you ignore a player's messages.
/silence [reason] :Toggles all whispers on/off, except for friends (give a reason is optional)
/silence* [reason] :Toggles all whispers on/off, including for friends (give a reason is optional)
/ban [username] :If enough players (in the same room) vote to ban a player, they will be removed from the room for an hour.
/report [username] :A popup will appear and you will be asked why you would like to report the player. A Moderator will decide
about the case when two people report.
If a player gets Banned from the game you will receive Karma.
What Karma ?
-Karma tells the Moderators how believable your Reports are !

/watch [username] :All mice are turned semi-transparent, except the mouse with username entered who is tinted pink. Multiple mice can be selected. This can be turned off by typing just /watch by itself.
/clear :Clears the chatbox.
/mod :See how many moderators are online.
/tribunal :Help moderators by watching reported players.
/f [country] :Waves a flag representing that country.For the countries and their codes, Read more !
/election :Shows the Election system.
/trade [username] : Sends trade request to specified player (must be in same room).
/mapcrew :See how many mapcrews are online.


5-Tribe:

/t [message] :Sends a message to tribe chat. Pressing T also allows you to use tribe chat.

/t*, /tc or /mt :Opens tribe chat in a new tab
/inv [username] :Invites the user to your tribehouse.
/invkick [username] :Kicks the user who was invited to your tribehouse.
/module [modulename] :Runs a module (minigame) (example: /module #fight). To stop the minigame, type the command followed by "stop".
/np (@code) : Changes map to specified map (ex: /np 34), or changes back to default map if no map specified.
/npp (@code) :Changes Map, but waits for 1st map to end, will just switch in a tribe house or utility
/neige :Makes it snow in the tribe house for 1 minute. Enter in command again to stop. (You must have particle details enabled to see the snow)
/ch [username] :Defines who will be the next Shaman.
/sy [username] :Define who will be the sync. Enter the command with nothing to reset.
/sy? :Find out who the current synchronizer is.
(one has to be a rank that's able to load maps)

/musique [Youtube video URL/mp3 link] :Plays the Youtube video/mp3.
Youtube videos will only play if there's a TV in the tribe house. The link with .mp3 in the end of it will only play for mice who has "Play music" option selected
in the in-game settings window.

6-Obtaining Free Stuff

/facebook :Will award your mouse with 20 cheese the first time, as well as open up the Transformice Facebook page.
/atelier801 :Gives you a cake hat in your shop inventory.
/code :Opens the box for typing codes that give rewards (from contests, attending a convention they are at, etc).

7-Technical Stuff

/version :Shows the "changelog" for the current version (in French).
/debug :Shows the collision boxes and physics of the game at work.
/lua :Opens up a window to write the lua scripting language.
/info (@code) :Displays information on the current map or the map specified.
/infoshop :When in the shop, shows the category and ID of each item on the top left corner (ex: "0, 3" (first number is category).

/parrain :Opens up the referral window.
/changepass :Opens the Change Password window.
/sauvertotem :Saves the current totem. You must be in totem editor for it to work.
/resettotem :Reset the current totem. You must be in totem editor for it to work.
/x_imj : Open the old menu of game modes
8-Others

/ping :View your ping.
/lsmap :List maps you've created.
/ips :Shows in the upper left corner of the game screen, the frame rate per second and current data in MB / s download.
/cips :Shows a graph with the current frame rate per second. The chart can be dragged anywhere on the screen.
/time :Show's cumulated play time for your account.
/nue :Disables/Enables the display of accessories used by other mice. Begins to assert in the next round.
This doesn't override the game disabling them when there are 50+ mice in the room, on bootcamp rooms, etc.
/font [font] :Changes the chat's font. font is a font you have on your system (default = verdana).Typing "/font" without a font specified will reset your font to the default.
/fontsize [?] :? is a positive whole number (default = 12)
/music or /musique [number] : Play a YouTube video while enjoying maps.
/langue [language] :Change the language used by the game (doesn't affect messages already onscreen). Must be a valid 2-letter language code, or else the game the game while be stuck with a black semi-transparent overlay and unresponsive to mouse clicks. Ex: /langue es
/clavier :Alternating between English and French keyboard.
/fs :Enable / disable the fullscreen function (full screen).


9-Mode Specific Commands

/skip If enough people skip, video will end early.

10-Guest commands

/nosouris :Changes your mouse color into default when you're a guest.



11-Removed commands

/^^ :Displayed information from your client / browser, Flash Player and system used to run the game.
/modeexpo :Removed the left side of the old standalone bar.
/rt [player name] :recruit people to tribes before the Recruit button took over.
/dance :The very first emote, it was a command until it got replaced/took over by the emote buttons.
/cry :An additional command until it got replaced/took over by the emote buttons.
/laugh :An additional command until it got replaced/took over by the emote buttons.
/kiss : An additional command until it got replaced/took over by the emote buttons.
/scroll :(Formerly?) locked the computer mouse/touchpad scroll wheel.
/filtre :Disable/Enable chat filter allowing see bad words.
/fps60 :Switch between 36 fps mode and 60 fps mode manually.
/tk [Player name ] : Kick out a player of his tribe
/pwet : Get in guest mode while remaining connected to our true account. This order was active time of the enigma of 4 years Transformice to be removed then.
/changepass : Open the window to change your password
/hynixy : Troll control during the 4 years of Enigma Transformice to lead the players on the wrong track. This command generates a random number between response, nop, and try again Almost

Do you like this Topic ? Do you think new commands should be added ? Which commands should be removed ?
Thanks for sharing your opinion with us !
Source : 1,2,3.
-I created this thread after i saw that there aren't any thread full of all transformice commands !

"If any new commands get added , the topic will be updated ."

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A big thanks to Dracoleaf for his help by adding too much removed commands! :D
And thanks to Sinnwidrig for adding one new command to this thread! :D
Thanks to Bodykudo for fixing the thread! :D