GeometryHUD

If you have a trigger item in the inventory, display the information corresponding to the item. It improves the gaming experience just a little bit more than using F3(meta-function).

!screenshot-000 !screenshot-001 !screenshot-002

Trigger Item	Information
compass	direction + respawn direction marker
lodestone compass	direction + lodestone direction marker
recovery compass	direction + last death direction marker
clock	in-game time
one of compasses + clock	coordinates + in-game time
map	mini map
spyglass	health gauge of mob
daylight detector	in-game days

These trigger items can also be placed in bundles, shulker boxes, enderchest.