The Wheels of Lull
A DLC-sized mod, but unlike Falskaar it was made by someone actually competent in a tenth of the time. Linking together all of Trainwiz's other mods, descend into the underworld of Nirn, around fifteen new quests, you'll confront strange new characters, with huge ass dungeons, puzzles, and unique weapons galore. It's probably the least train-related mod he's made.
The Lost Wonders of Mzark
Lost Wonders of Mzark is a quest/dungeon mod for those who prefer a more puzzle-oriented game. The enemies you encounter within must be disposed of in careful ways, and you'll find more than just fights awaiting you in the depths of Mzarnumez. You might think of it like Dead Money, but for Skyrim.
Aethernautics- A Space Travel Mod
Aethernautics is a quest mod that adds several new areas, a new weapon type, new armors, new enemies, and of course, a spaceship that has space travel!
Blackreach Railroad is a travel and quest mod for the steam-oriented player. It adds a locomotive, a train line, and a series of train stations around Blackreach and other Dwemer ruins. After a short quest to reactivate the train, the player may then freely ride the engine throughout Blackreach. In addition to this, the player may choose to ride on uncharted track, thereby unlocking new stations throughout Skyrim. And for those wondering, you do indeed get a train hat.
Solstheim - The Lost Levels
Solstheim – The Lost Levels is an add-on for the Dragonborn DLC that adds 6 caves, 8 plants, 1 book and 4 quests. The content is based on The Elder Scrolls III: Morrowind and its expansion, Bloodmoon.
Sidequests of Skyrim
"Skyrim will have infinite quests!" - Todd Howard
Beyond Skyrim - Bruma SE
The first chapter in the Beyond Skyrim series, Bruma, aka Skyrim 2.0.
Finding Susanna Alive - A Blood on the Ice Trigger Revision
This mod changes how Blood on the Ice is triggered to ensure that you'll be able to meet Susanna the Wicked alive and well in Candlehearth Hall before the butcher strikes.
Finding Helgi... and Laelette - A Laid to Rest Overhaul
A home in Morthal burned down under mysterious circumstances; some say it was the murder of a wife and daughter. A woman leaves home without saying goodbye to her husband and son, ostensibly to join the war. Are these events connected? This is an overhaul of "Laid to Rest" and the third mod in the "Finding" series.
Fixes some issues with the quest to find Derkeethus, such as moving his cell key to a more logical location (i.e. not inside his cell with him), exposing the quest information in your journal, optionally adding a quest marker, and expanding the dialog options for all those involved.
Finding Velehk Sain
This mod creates additional content surrounding the strange gauntlet in the Midden Dark, as well as the four missing Apprentices from the College of Winterhold.
A port of Archon Entertainment's Heimfeigr mod. A mysterious new Nordic Tomb located north of Winterhold.
Nilheim - Misc Quest Expansion
Fixes some issues with the misc quest at Nilheim and gives a bit more flexibility to your encounter with good old Telrav, adding a couple of additional dialogue choices and options for roleplaying.
Another massive questline by Vicn this time inspired by Bloodborne. It's still a WIP
Paarthurnax - Quest Expansion
A fully voiced, quite expanded new take on the quest Paarthurnax, giving both the Blades and Paarthurnax good reasons for their stances, and you, Dragonborn, the final choice.
A strange island has risen from the depths of the sea, an expedition to uncover its mystery is already on its way. Following the expedition's footsteps you uncover a tale of treachery, madness and dark secrets before you self are drawn into the Maelstrom. Features a fully voice acted follower and a multipart dungeon questline with two endings.
The Tale of Tsatampra Xiros
Explore a world contained within the pages of a sorcerous text, and earn the favor of the Daedric Prince Hermaeus Mora.
Investigate the madness afflicting the Northern Asylum of Julianos, and earn the boon of the Madgod himself. All glory to the Prince of Fools! New enemies, spells, armour, weapons, and a player home await...
Voyage to the Dreamborne Isles SE
Embark on a grand quest to strange new lands, help people in need, and conquer your nightmares.
The Shadow of Meresis
The Shadow of Meresis adds "an extensive quest, leading you to various places all over Skyrim. In addition to new locations and dungeons you'll meet new NPCs with more than 200 fully voiced lines of dialogue spoken by three actors. The playtime is about two to three hours."
The East Empire Company commissions the Dragonborn to slay a dragon that is interrupting trade routes throughout Skyrim. But is the dragon stirring up trouble with a particular reason and what sinister motive does it have for its actions?
A quest where you can join the Penitus Oculatus after the vanilla "destroy the dark brotherhood" quest and get all the rewards.
Project AHO is a large quest modification, comparable in size to a medium-sized DLC. Designed in the best traditions of Bethesda Game Studios, this mod adds to Skyrim a hidden settlement of Great House Telvanni. Determine its fate for yourself!
From the creators of Project AHO, Carved Brink is another DLC-esque quest/dungeon mod, it adds some amazing rooms to explore, quests to finish, collectibles to find and screenshots to take this mod is BEAUTIFUL. ... buuuut the writing is kind of bad and dialogue is laughable at times, very incoherent in my opinion, AHO definetely does a better job in the writing department. Still very much worth a playthrough.
Another great quest mod by Vicn. This one is a small, and fluffy, quest that takes you to a castle of a half-dragon girl. Even has an fun boss fight! That's something new for Skyrim.
Adds notice boards around cities that serve as radiant quest hubs. This notice board contains many different quest notes. Every note starts a quest when it is selected (it immediately show you the quest description once chosen). Most of them are radiant quests. This means that are repeatable (with different characters or locations). As an alternative, also look at Missives and decide which is your preference.
Similar to Notice Board in its mission, but different in application, Missives quote "adds a large number of localized radiant quests found at Missive Boards of varying difficulty and with varying rewards." The author lists all the issues he had with The Notice Board that led him to create Missives, head it on the mod page and decide which is best for you
Clockwork (Clockwork Castle)
Clockwork is a quest mod for Skyrim set in and around Clockwork Castle; a full-featured player home. Once found, you may call the castle home... but if you want to leave, you'll need to discover how to escape.
A very Dark Souls/Bloodborne inspired quest mod that is full of unique locations and unique bosses.
A pretty unique and Dark Souls inspired island fortress you can travel to. There are plenty of places to explore there and enemies to fight, but there isn't exactly a quest there.
Legacy of the Dragonborn
(aka Dragonborn Gallery) is a mod centered around endgame content. Meet the curator Auryen Morellus at the museum in Solitude and he will help guide you in your quest to gather the many relics of Tamriel's history as well as provide a fully equipped player home and many many more quests as well.
The Gray Cowl of Nocturnal
A really well made and interesting quest mod that makes you travel all the way to Hammerfell to find the Gray Cowl from Oblivion. The story is fairly simple and fun and so are all of the new places you visit. The only real problems is the voice acting but that's to be expected with most mods and that it's pretty lore breaking. Highly recommend this if you're looking for a new quest mod to dig into.
Moon and Star
A nice and simple quest mod revolving around dunmer and dwemer. It has good voice acting and actually adds a lot of extra things to go along with the quest itself. Well worth a try!
Moonpath to Elsweyr
Probably one of the coolest and most unique quest mods out there. The only downside is that the locations are very linear, it's pretty short, and the quests are boring. It looks cool though, right?
Skyrim Sewers 4
What better way to play an Elder Scrolls game without going THROUGH THE FUCKING SEWERS!?!?!?!?!?!?!?!?!?!?!?!?!?!?!?!?! None.
Stop necromancers from doing necromancy things in this amazing new questline. It's really well done and it even adds a ton of new features to the Necromancy school of sorcery as well. New spells and traits can be unlocked when you finish this quest!
Beyond reach is an expansive world space mod that takes place... beyond the reach, just east of High Rock! Explore dark and grim looking locations as well as partake in a variety of new quests.
The Forgotten City is an expansion mod offering a unique 6 - 8 hour experience: a murder mystery investigation set in an ancient underground city. You'll need to solve it using your wits, and the ability to travel through time. It has a dark, non-linear story in which you'll interrogate suspects, explore the city and its many secrets, and navigate challenging moral dilemmas. -10/10 IGN "it's okay"
The Hanging Gardens - A Quest
A quest mod playing out on a remote abandoned Dwemer island/outpost with a secret, featuring a medium length quest for mid/high level player characters with an interest in exploring, new surroundings, and a good fight. Features voiced NPC, unique items & ingredients found only on the island, 2 smallish worldspaces, 14 or so interior cells, sea travel complete with pirate raids, a metric ton of dwemer treasure and a foe thought long gone from this realm.
Inferno- Envoys of End - SSE port
The Ascended have arisen once more to set their plans in motion, this time accompanied by powerful beings of a world unknown. Only you, the Dragonborn can set the world right once again.
Glenmoril - NPC Overhaul
Overhauls appearance of NPCs in the mod "GLENMORIL".
Vigilant - NPC Overhaul
Overhauls appearance of all NPCs in the mod "VIGILANT". No esp.
Vigilant Book Covers
Adds Covers to all Books, Journals and Notes in the mod VIGILANT.
Beyond Reach - Tweaks and Enhancements
A compilation of tweaks for Beyond Reach.
Vigilant Armors and Weapons Retexture SE
This mod retextures most armors and weapons from the popular mod "Vigilant" by Vicn. All textures are upscaled to twice their original size
Unslaad English Voiced
Gives the quest mod Unslaad voice acting.
Gray Cowl of Nocturnal Alikr Flora Overhaul
This mod adds a lot of flora in and around the colony, plus some more in the other oasis scattered across the desert.
Notice Board - Dragonborn DLC - Better Solstheim Quests
This mod fixes the Notice Board on Solstheim. It expands the patch to have more suitable quests for Solstheim.
Vigilant Voiced - English Addon
The mod before you is an English voice acting addon for Vigilant, brought to you by 23 incredibly talented voice actors and the author of the latest English translation. Every single character you will meet during your journey as a Vigilant of Stendarr is now voiced and waiting to talk to you.
Custom Skills Framework
Allows mod authors to create unlimited amount of new custom skills with their own perk trees.
Custom Skills - GLENMORIL
Adds a perk tree fitting for a witchhunter.
Custom Skills - VIGILANT
Adds a skill tree fitting for a Vigilant of Stendarr.
Expanded Towns and Cities (SSE)
Expands upon existing towns, villages, settlements, cities, etc. (This is a complete rebuild of the LE version - Not a direct port.) So far includes Darkwater Crossing, Dawnstar, Riverwood and Rorikstead. Other towns will be added as they're completed. (Morthal currently in-progress.)
Riften Docks Overhaul
Docks overhaul for Riften created by combining and tweaking several high-quality mods.
Whiterun Expansion Redone SSE
Whiterun is at the center of Skyrim making it the trading capital. Whiterun is also the first city the player is likely to visit. Therefore we should be treated to a much larger city to begin our journey. Whiterun will almost double in size by expanding the northeastern region of the city.
Obscure's College of Winterhold
This mod is an expansion and overhaul for the College of Winterhold, including two new towers, a re-imagined Arcanaeum and Hall of the Elements, revised set dressing and clutter in many areas, changes that appear over time, door signs to assist with navigation, support for many other mods, and not a trace of hay.
Riften Extension - Southwoods District
Extends Riften beyond its walls with a new district running along the southern road. Includes seven new buildings ,an outdoor eating space, and 20 new npcs with ai packages.
The Great City of Solitude SSE
Overhaul of the Solitude Docks, works with Enhanced Solitude!
The Walls of Whiterun
Adds walls and ruins around Whiterun's outskirts.
Fortified Whiterun seeks to bring realistic and logical defenses to our most beloved city.
Capital Whiterun Expansion
Just like the Windhelm mod this mod overhauls Whiterun, giving it more shops, buildings and NPCs. It also adds more housing districts. It's a must have mod. Oh and it even has a JK patch.
Capital Windhelm Expansion
A massive overhaul of Windhelm, changing the layout and look of the city. It also adds new houses, NPCs and areas to explore. Best part is it has a JK Skyrim Patch.
Dark's Whiterun Market
This mod adds a market in the outskirts of Whiterun.
Enhanced Solitude SSE
The best Solitude mods, merged together into a single plugin, with multiple fixes, tweaks and enhancements.
The Great Town of Shor's Stone SSE
Makes Shor's Stone the town it was always meant to be!
The Great Village of Old Hroldan SSE
Makes Old Hroldan the village it always should have been!
The Great Town of Ivarstead SSE
Makes Ivarstead the town it was always meant to be!
The Great Town of Karthwasten SSE
Makes Karthwasten the mining community it always should have been!
Cities of the North - Dawnstar
A new set of unique buildings for the capital of the Pale.
Cities of the North - Morthal
A new set of unique buildings for the capital of Hjaalmarch.
Cities of the North - Winterhold
A new set of unique buildings for the capital of the northernmost Hold.
Windhelm Bridge Overhaul
Removes all the flora and snowdrifts from the bridge, removes flora from the rockcliff near the entrance to Windhelm City (dead shrub and tree vine mapel), also removes a few CWrubble. It adds a market on the way to the city so you can stop by and trade there is also a guardpost inside/underneath the bridge.
Tactical Valtheim is a redesign of Valtheim Towers into Valtheim Keep. Built on and around the original Valtheim, trying to make it into an actual fortress while maintaining something like the original atmosphere and style.
Apachii Divine Elegance Store
This mod adds a small comfy store near Markarth. The amazing part is this mod sells tons of different modded clothing and accessories.
Solitude Exterior Addon
This mod adds a small huddle of buildings just outside of Solitude, near the farms.
Books of Skyrim
Adds a comfy little bookstore to Solitude.
Adds a lighthouse to Windhelm since they kinda need one.
Legendary Cities - Tes Arena
This mod adds ten historical cities to Skyrim present in TES:Arena. This mod adds these settlements back into the game.
Immersive Fort Dawnguard
An overhaul of Dayspring Canyon.
Immersive College of Winterhold
This mod changes a bunch of shit on the College, it allows you to give the role of Archmage to Tolfdir, changes many of the rooms and adds new ones. A pretty in-depth overhaul of the College.
Winterhold - Expanded Ruins
This adds extra ruins to Winterhold, making it feel like something bad really did happen which caused parts of the town to sink.
Immersive Dawnguard Dayspring Pass
This mod adds map markers and changes the Dayspring Canyon entrance to be more immersive and believable. So now, it looks like an actual pass instead of just this little cave in a mountain.
Hold Border Banners
Adds banners at crossroads which mark the borders between each region/hold in Skyrim. It reminds me of how faction regions were split in WOW except in this game, it doesn't really matter gameplay wise and is only for aesthetics.
Adds a new questline and story around the rebuilding of Helgen. It includes new NPCs, shops, and the voice acting isn't half bad either.