I picked some mods from my sub list trying to find entries at around 1000 subs on Steam Workshop, so unlikely to be on top 10 list cause they are mostly unknown. Prisoner Recreation is slightly more popular than that but I included it with Prison Commons cause I think functionality they provide should be included in base game/future DLC in some form. In no particular order:

Prisoner Recreation – useful in multiple scenarios. House arrests for rowdy colonists, keeping sanguophage bloodbags happy, giving prisoners you want to recruit a glimpse of life in your colony, having separate prisons for low and higher security prisoners etc. Also good for role play. Combine with Prison Commons.

Perspective Paths – gizmo for making floors with hard edges. Dunno how to explain it in writing, better to look at it yourself.

Sanguophage Feed Relationship – nice to have for additional flavour when playing with sanguophages.

Picnic Area – allows pawns to eat in a designated outside area. Must have mod for making parks, squares and what not usable and not only decorative.

KanbanStockpile – adds stack refill threshold and stack limit settings to stockpiles. A must have to keep kitchens and canteens running smoothly.

Curb Stone – self explanatory.

Pawn Centric Work Priorities – adds a work priorities tab in pawn menu.

I skipped race, hair, furniture and other assets mods cause they are more of a personal preference. Same with less popular submods for bigger mods like Dubs Bad Hygiene. Hope this is of some use to you!

RimForge - Only Power Poles

RimForge is neat, but my favorite part was these stringable power cables. Gives your base a more realistic look, and is a cool alternative to laying regular wires. They’re really fun to drape all over your base and come in a few different colors!