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.
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.
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.
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.
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.
SeaPoint Settlement is a little fishing town near the north coast, near Castle Volkihar.
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.
Windhelm Exterior Altered
Alters the Windhelm docks by adding some new structures and moving around some objects.
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.