Coordinates HUD - Displays XYZ above your toolbar
Multiplayer sleep - Not all players have to sleep
Name colours - Change the colour of your name
Nether Portal Cords - relative overworld/nether positions
Player head drops - PvP kills reward the victims head
Real time clock - View how long the server has existed
Spectator Nightvision - Spectators can see in the dark
Track statistics - Tracks stats processed beforehand
Track raw statistics - Tracks 100+ different stats
C2ME - Improve performance of chunk generation
Chunky - Pre-generates chunks quickly and efficiently
Fabric-carpet - Technical control of the game
Ledger - Server-side logging plugin
Lithium - General purpose optimization
nochatreports - makes chat unreportable
scalablelux - Improves performance of light updates
Zombify - Villagers always turn into zombies