Open Chat window in game by pressing c
make sure you add the / before the command to let Eco know this is a special command
Commands in ( ) are an accepted shortened version of full command.

User Commands are for everyone to use
Admin Commands are for only those that are an Admin on a Server
(a singleplayer (solo) world makes the player hosting Admin by default)

Word of warning
Some Admin commands can break a world save if not used correctly.

Note:
These Commands were copied from various screenshots of the chat window after typing
/helpful so hopefully there are not too many typing errors.

As far as i can tell these commands are complete and up to date, but some more commands may be added when updates are added to the game.

/avatar thirdperson
Toggles Third Person Camera.

/civics elections
List running elections.

/civics listdems
List each demographic and who is in it.

/civics mydems
List each demographic and the status of the specified user (using the called if none specified).

/civics showgovernment
Lists the active elements of the government.

/civics showtick
Show time until the next civics tick.

/economy allwages
Display all wages paid in the game

/economy mywages
Display all wages paid in the game

/emote angry
Angry

/emote frown
Frown

/emote grin
Grin

/emote smile
Smile

/emote smirk
Smirk

/emote yawn
Yawn

/help
Displays all the commands available with hidden subcommands. Accepts a string to filter commands to a search string.

/helpful
Shows all help, including sub commands.

/land mark (/mark)
Drops a waypoint at the current position. Accepts an optional text string for the waypoint.

/manage authlevel
Displays your authorization level

/manage ignore (/ignore)
Shows your Ignore List or adds the player to the Ignore List by the name or remove if the player is on the list already

/manage listadmins
Displays a list of all administrators.

/manage players
Returns a list of online players

/manage playtime (/playtime)
Lists the playtimes of a given / or yourself if none passed.

/manage useractivity
Displays a list of users and when they last logged in.

/manage whatami
View your current skill title

/manage whoami
Shows your user ID

/money accounts
Displays all bank accounts in the game.

/money currencies
lists all currencies in the game.

/objects list
List all objects of the given type.

/rooms test
Check the current surroundings to see if it's a room, and if not explain why not

/sim sealevel (/sea)
Displays the current sea level and how much it has risen.

/time now
Reports the current time.

/titles list
Lists all exisiting titles and info about them

/util unstuck (/unstuck)
Attempts to unstuck your avatar.

/util unstuckvehicle (/freecar)
Attempts to unstuck vehicle in target

/build building (/bt)
Spawns a building by specifying which tier

/build buildingofmaterial (/bm)
Spawns a building by specifying the material to use

/build road (/road)
Spawns a road

/build stockpile
Spawns a stockpile containing stacks of the listed items.

/build store
Spawns a store with storages and random trade offers

/build village
Spawns a village

/civics clearoldelections
Remove record of a specific election, or if none passed, all previous elections

/civics debug
Toggle debug display of civic processing. Pass 'false' to see for only yourself.

/civics fallelection
End the election with a negative vote.

/civics finishelection (/fin)
Force-end the specified election, adding a vote if true is passed (default).

/civics removeconst
Remove the current constitution.

/civics spawnconst
Spawn a blank constitution if it's missing

/civics ticknow
Force a tick on the civics system to happen immediately.

/civics updatedems
Force demographics to update immediately.

/civics vote
Vote in the given election for the given candidate.

/civics winelection
Force-win an election, either with the specified candidate, or 'yes' if it's a binary election.

/districts add
Set the current area within a given radius to a given district (or a new district if none is passed).

/districts clearmap
Remove all districts from a given map.

/food eat (/eat)
Max your calories

/food work (/work)
Spends calories

/inventory carryall (/carryall)
Allows carry items into any user inventory slot and removes weight check. Pass false to reset to normal.

/inventory dumpall (/dumpall)
Dumps all items in your inventory.

/inventory dumpcarried (/dumpcarried)
Dumps all carried items.

/inventory dumpselected (/dumpselected)
Dumps all items in your slected toolbar slot.

/inventory durability
Set the durability of the item you are holding

/inventory forcegive (/fgive)
Give yourself an item (forced, Ignores restrictions)"

/inventory give (/give)
Give yourself an item

/land clearrubble
Clears rubble around the player.

/land level (/level)
level the terrain

/land massinteract
uses your currently selected tool on surrounding blocks

/land remove (/remove)
Remove block types within a specified area

/land removeallbut (/removeallbut)
Removes all block types except the specified type within a specified area

/land spawnrubble
Rains rubble around the player.

/manage admin (/admin)
Adds user as an Admin by account id, steamid, slgid, or username

/manage alert
Sends an alert to everybody

/manage announce
Sends an announce to all players

/manage ban (/ban)
Bans use by account id, steamid, slgid, or username

/manage clearobjective
Clears a user's objective

/manage kick (/kick)
kicks player

/manage listusers
Displays a list of all known users, showing username and ID.

/manage removeadmin
Removes user as an Admin

/manage save
Save the world!

/manage setreputation
A command to set the user's reputation

/manage setreputationrelative
Set the user's reputation to another

/manage setspawn
Changes the spawn location to your current location

/manage showban (/showban)
Show usernames of banned players

/manage unban (/unban)
Bans user by account id, steam id, slgid, or username

/manage warnuser
Sends a warning to a citizen

/manage whitelist
Adds user to the whitelist by account id, steamid, slgid, or username

/manage whois
Shows the user ID of the requested user.

/meteor addhours
Adds Meteor impact hours

/meteor destroy
Destroys the meteor in orbit.

/meteor makevisible
Make the meteor enter the targetable range, or the specified angle if one is passed in.

/money addaccountmanager
Adds user as manager to bank account with ID.

/money addaccountuser
Adds user to bank account with ID.

/money cancelalldebtfromplayer
Cancel debt that a particular player has accumulated.

/money createaccount
Creates an account with specified name.

/money createdebt
Create debt between two players in a currency that matches the given name.

/money deleteaccount
Deletes an account even if there is still currency on it.

/money removeaccountmanager
Remove user as manager from bank account with ID.

/money removeaccountuser
Removes user from bank account with ID.

/money setaccountowner
manually set an account creator.

/money steamsale (/gabe)
give every player an amount of money.

/money tax
Tax all accounts in all currencies a specified amount of money, into the treasury by default or a specified account.

/objects add
Add an object of the give type.

/objects clear
Removes all objects of a given type.

/objects edit
Edit a specific object of a given type. Can specify by name or ID.

/objects remove
Remove a specific object. Can specify by name or ID.

/objects removeall
Remove all object of a given type. Be careful! Can specify by name or ID.

/pollute air
Creates X tons of air pollution

/pollute all
Rains tailings from the heavens to ruin the world

/pollute co2
Changes CO2 PPM by X

/pollute trashcity
just in case you like living in TRASH CITY

/property add
Adds user to current deed (if username is not provided then adds current user)

/property claimrect (/claim)
claim,Claims plots in a given rect.

/property ownall
Claim all property

/property owner (/owner)
Change owner of current deed

/property ownnone
Revoke your property

/property remove
Removes user from current deed (if username is not provided then removes current user)

/property targetowner (/ownit)
Change owner of current target

/property unclaim (/unclaim)
Unclaim the plot you're standing on

/property unclaimabandoned
Unclaim plots across the world where the owner hasn't logged in for X days

/rooms repairall
Repairs all broken rooms. This command may take a long time and create heavy-load on the server, so only use it when many rooms are broken

/sim dinnerbell
Makes all animals hungry.

/sim greenthumb
Spawns random plants

/sim killplants
kills all plants in an area, Pass true to delete them.

/sim killtrees
Cuts all tree in an area. Pass true to delete them.

/sim massplant
Spawns a bunch of one plant

/sim oneshot
Kills nearest animal

/sim regenlayer
Regenerates a world layer, restoring it to the state it would be in if the world were newly generated.

/sim removedeadplants
Removes dead plants in an area.

/sim setlayer
Sets a world layer to specific value or random value from range.

/sim spawnallplants (/allplants)
Spawns plants of particular ages in a row

/sim spawnanimal (/animal)
spawns a number of animals

/sim spawnplant (/plant)
Spawns a plant or plants in a row with increasing ages

/sim trample
trample the surrounding ground

/sim unpollute
unpollute an area. Remove dead plants and replace dirt on grass blocks.

/skills all
unlock all skills

/skills fullreset
Resets all skills to unlearnt

/skills givepointsme (/point)
Give yourself speciality points

/skills givepointsto
Give skillpoints to another player

/skills levelup (/levelup)
Levels up a string matching the passed skill's name to the max.

/skills levelupuser
level up a citizen by one. Default levels you up.

/skills notalents (/notalents)
Resets all talents

/skills rate
Displays or sets the current skill rate multiplier.

/skills removetalent (/talentdel)
Removes talent by name

/skills reset
Resets all skills to default

/teleport atob
Teleports player A to player B

/teleport targetto
Teleports otherPlayer to an xyz coordinate

/teleport tocoords (/moveto)
Teleport to an xyz coordinate.

/teleport todark
Teleport to opposite of the World

/teleport toplayer (/tpto)
Teleport to a citizen.

/teleport toworldposition (/tp)
Teleport to xz coordinate. Y is calculated automatically.

/time fastforward (/ff)
Force the world to fast forward. Pass 0 to stop.

/time midnight
Set time of day to midnight

/time noon (/noon)
Set time to noon.

/time resettime (/resettime)
Reset time of day to match the clock.

/time set
Set time of day to the specified hour

/titles assign
Assign a given user to a given title, assigning to yourself if none is specified.

/titles clear
Clears all occupants from a title.

/titles delete
Permanently deletes a title.

/titles rename
Rename a new title.

/titles set
Set values for a title.

/titles unassign
Removes a given user from a given title, removing from yourself if none is specified.

/util fly (/fly)
Toggles fly mode

/util fuel (/fuel)
Fuels currently selected (driving) vehicle.

/util openserverui (/serverui)
Opens the server GUI, if the user is a local user.

/util record (/record)
Toggles record mode