some of the mods i run:

Awle Stats - customizable information overlay
Plant Everything- self explanatory
Plant Easily - extension for plant everything, grid farming basically
Better Creative - adds ALL of the in game build pieces, including boss stones, monsters, spawners, Haldor etc etc etc... pieces are selected from the hammer menu
BetterWards/Ward is Love - adds addtional properties to wards
First Person View- 1st person mode, scroll all the way into 1st person perspective
Building Repair - Hotkey repairing for a specified radius around you
Chatter - a in game chat redesign, fully customizable
Comfy Signs - ability to customize signs, color, size, and length of message
Dig Deeper - self explanatory
Dual Weilding - self explanatory
Emote Wheel - self explanatory
faster crafting - self explanatory
Floors are Roofs - self explanatory
Gizmo Reloaded - rotate build pieces on ALL axises
Helmet Be Gone - hide your helmet so u can see your hair
Hit Box Fix - makes hitboxes function appopriately on slopes
Instant Monster Drop - loot from defeated mobs drops instantly
Hoe Radius - adjustable radius for all things with your hoe
Infinity Hammer - LOTS of options here.... too many to list / admin tool
Item Stands all Items - self explanatory
Jotunn - necessary for some mods to function
Map Details - colors structures / buildings on the map / minimap
Map teleport - self explanatory
Mist Be Gone - self explanatory
Mount Up - mount and ride all the animals, including other players!
No tool delay - self explanatory
Skip Intro - self explanatory
Trash Items - adds a trash can to the inventory screen, very useful
Quick Teleport - makes portal time faster
ServerDevCommands - admin tool
SleepOver - Bed options
I Have Arrived - customizable arrival messages
Vanity - reskin ANYTHING
VNEI - useful admin tool, catalog of everything
wearable trophies - self explanatory
World Edit Commands - terrain tools / admin tool
Upgrade World - admin tool, i mainly use it to reset dungeon areas / chests on my server