Gameplay Realism
 
Duncan's Falling Down v2.01 – Tribunal
Makes you keep an eye on your fatigue. As you lose fatigue your strength, agility, speed, and endurance are reduced.  Let your fatigue go below 15% and you lose the ability to jump.  If your fatigue reaches zero you will fall helpless to the ground; easy prey for any nearby enemies.
 
Duncan's Sleep or Suffer v1.1
Sleep is now a necessity.  If you go too long without sleep, your character will feel the effects of sleep deprivation.
 
Tejón's Fatigue Effects v1.21
A collection of three mods, which can be applied individually or as a complete package which apply various penalizes as the player's fatigue decreases.
 
ModMan's Hunger Mod v2.0
Eating is now a necessity.  You must now eat once a day or suffer loss of physical attributes.  Adds 3 new vendors who sell new food ration items.  You can also eat over a dozen types of existing ingredients to sate your hunger.
 
Balor's Primary Needs
Adds to the game the need to eat, drink and sleep for your character.   If you don’t take care of life’s necessities, your character will have increasing penalties the longer that his/her basic needs are not met.
 
Sendai45's Blight Infections
Makes you no longer immune to blight storms.  If you are out in a blight storm you risk infection from all of the same nasty varieties of the blight that you can receive from diseased creatures.
 
Snakejawz’s Get Diseases
Makes the player contract a wider variety of the game’s diseases from the diseased and blighted animals, rather than a few as it is in the default game.
 
Vanhike's Service Requirements v1.41
Membership and ranks in the guilds and factions now mean something as they affect what services you can use.
 
Jesus Freak's Realistic Training - Combat
Adds a new way of training (the default method remains in the game).  Adds several NPCs who will spar with the player for a slight fee.  These trainers can be found at all of the fighters guilds and Imperial forts.
 
Caine's Guard Expander v1.1
Adds more variety to the guards of Morrowind.  Guards at the entrances of most towns/forts are armed with spears.  Patrollers walk the streets, making sure everything is in order.  Archers keep the peace from above.   Guards on ships have been changed to Sailors.
 
Eric's Better Vaults v1.0
Makes it so that if the Player enters one of the vaults of one of the Great Houses and does not hold a rank of master or above in that House, then a bounty is placed on his/her head and the Player is subject to attack by the vault guards.
 
Kirel's Fast Break v1.0
Allows you to sprint at increased speed in return for increased fatigue drain.   The higher your athletics skill, the more of a speed boost you'll get.   Drawn weapons/spells double the fatigue drain while sprinting.   Sprinting also lets you jump further, but beware, the large jumps usually come with a hard landing - the higher your agility the less impact the jump will have on your character.
 
Zappara's Temperature v1.0
Adds temperature values and effects to Morrowind.   Only the Player is affected.  Walking near lava is now highly lethal.  Use of fire and frost resistance spells in cold/hot environments lessens the effects of extreme temperatures.  Fur armors protect you in cold temperatures.   Temperature is calculated every 10 seconds, and there are no long-term temperature effects like hypothermia, but you can get killed if you stay too long in cold or hot extremes.
 
P   Yacoby's Swimming Realism v1.2
Adds realism to swimming (No more swimming in full deadric armor.    Wearing Medium of Heavy armor while swimming will deplete your fatigue level, depending on how much you are wearing and what (Helms, gauntlets etc).    You also lose 80% of your carrying capability while swimming.   Mod also affects weapon effectiveness under water.   Now only spears, daggers and hand-to-hand are effective against underwater foes.
 
Yacoby's Drug Realism v1.0
Adds realism to the way merchants handle drugs.  They will barter with you if are carrying drugs, but if you try to sell them drugs, as soon as you end the conversation, they will call the guards.
 
P   Yacoby's Pursuit Enhanced v1.2.1 ++
NPCs or creatures that are attacking you will now you follow you through load doors if you attempt to escape their "wrath".  The time it takes for them to go through the doors is based on factors like their distance away from the door when the player goes through it, and whether the enemy can see the player when he or she goes through the door.  Your enemies won't be able to follow you through the door if you lock it, unless they have a high security.  Those lock spells are now no longer useless.
 
Zennorious' Regionally Known Criminals v1.1
Makes crime on Morrowind region dependent.  This means that after you commit a crime in Balmora people in Caldera won't know about your crimes, but when you return to Balmora you will get your bounty back.  After a certain crime level people in other towns will also hear about your crimes.  The news of your crimes will only spread to towns that have the same kind of guards as in the town you committed the crime.
 
Sosthenes’ Fall Damage
Makes falling much more dangerous.  Even small falls can hurt you.
 
Sisco’s Fire Hurt
Fire now hurts you when you stand on it or walk through it.
 
SiNNeR's Unskilled Books
Converts all skill books to normal books and eliminates the ability to gain skills through reading rather than gaining them from practise and use.
 
Evilgreebo's Bathmod v2.0
Adds the need to take a bath to the game.  You need to wash every few days or you start to smell and suffer a Personality Penalty.  Bathing will make you smell better, adding a minor magic effect for 24 hours.  All of the towns have baths which add different effects depending on what type they are.  There is also 3 special baths which add extra effects.
 
Texture Freak’s Longboat Replacer
Replaces the sails on the ships in the harbors and ports with furled sails rather than the unrealistic unfurled ones
 
TheLys & others’ Complete Doors and Locks
Makes several NPCs go indoors at night and the shops lock up for the night.   Add lock bashing so you can bash open door and chest locks
 
VenomByte’s Goldweight
Gold coins now have weight: .01 per gold piece.  1,000 drakes weighs 10 units.   No more running around with tens of thousands gold pieces in your pockets.
 
Tonto's MWE Gold Burden**
Adds weight to gold pieces by placing a dynamic spell on the character.   For every 100 pieces of gold you carry, you will acquire a single point of burden.
 
Mal’isirion’s Realistic & Expansion Weather mod
Changes the weather in Morrowind to be more appropriate for the regions.   For example, the Bitter Coast gets more rain and fog because it is lowland.
 
Arsonide’s Endless Adventure: Primal
Several of the Morrowind creatures will now build lairs.  If you come across one of these, there will be a few creatures outside protecting it or simply milling about.   If you decide to attack the lair, the creatures will come out to protect it.   The lairs are often a source of ingredients.
 
Sal Maker's Animal Realism v1.0
A simple modification that makes for more believable animal behavior. No more suicide attacks by rats, fish, cliff racers, etc.  Blighted animals will still attack as normal because the blight has caused them to lose their internal instincts.   Also, 'stronger looking' animals have been made stronger.
 
Demosthenes’ Wooden Fort - Raven Rock
Adds a more realistic fortification to the Raven Rock colony.  You still must complete the colony quests in order to receive the full services of the new fort
 
Taddeus & Nymeria’s Necessities of Morrowind v2.12 (+ Role Playing Realsim)
Adds to the game the need to eat, drink and sleep for your character.   If you don’t take care of life’s necessities, your character will have increasing penalties the longer that his/her basic needs are not met.  Obviously, eating and drinking will eliminate the penalties.  Adds many features including cooking and building fires.  Adds optional features to get drunk by drinking alcoholic beverages.