This is my short list with the best of the settlement mods available in my personal opinion. There are a LOT of really great settlement mods out there and I've got a guide that lists most of them if you're looking for hidden gems or have different taste (or building needs) than I do. I personally trend towards clean or at least shabby chic but for this list I'll include postwar for you destroyed look lovers out there.
- Auto Doors
- Brighter Settlement Lights
- Clean My Settlement REDUX pair with Raze My Settlement
- Place Everywhere
- Quieter Settlements
- Settlement Menu Manager (SMM)
- Shaikujin's Better warning for settlements being attacked
- Workshop Framework
- Workshop Plus
- Whisper's Workshop Utilities (Some Place Everywhere features for non-F4SE users)
Decor & Furniture
Everything & Kitchen Sink
Gorgeous Beyond Compare
- Nuka Mix Lantern Workshop (Also included in The Bleachers and FSD quest mods)
- Unicorn Farts and Godrays Stained Glass Workshop Mod
- Wasteland Gardening - planters are vanilla objects but flowers are new textures & types.
- Fusebox Generator Plus
- NISTRON Electrical And Electronics Engineering Volume 1 - everything you could ever want related to settlement power in one mod
- Wireless Workshop Items
Saving/Transferring Your Builds
Theme: Classic Fallout
I'm totally biased on these (mods by the Creative team)
- Apocalypse Supplies by Damanding/Crayonkit
- CatDeco Floors and More by Sarinia
- Creative Clutter by Creative Team - has both pre and postwar content.
- Creative Gardens by frogprincessQ4 via discord (requires SMM)
- CREAtive Teddy Bears by frogprincess_Q4 - also available via discord (requires SMM)
- Do It Yourshelf Updated by Dinozaurz and Damanding/Crayonkit
- Fusebox Generator Plus by Damanding/Crayonkit
- Modular Kitchen Updated by Evanpox and Damanding/Crayonkit - has both pre and postwar content.
- Neon Flats Workshop by Damanding/Crayonkit, Robboten, Terrybeer, et. al.
- Noir Penthouse Workshop by Damanding/Crayonkit, Robboten, Terrybeer, et. al.
- Prewar Power Armor Displays - OR - Postwar by Terrybeer and Damanding/Crayonkit
- Rainbow Of Child BEDS by Frogprincess_Q4 - also available via discord (requires SMM)
- RedRocketTV Workshop by Damanding/Crayonkit
- School Desks by Frogprincess_Q4 - also available via discord (requires SMM)
- V's Community Art by Vronykah via discord
- V's Scavver Art by Vronykah via discord - has both clean and cleanish content.
- V's Stylish Decor by Vronykah via discord - has both clean and cleanish content.
- VR Desert Island Extended by Damanding/Crayonkit