Croebh
Lets you see the distances to other characters, as well as being able to set the height of a character
David Severwright
Hide the name etc from tokens so players can't metagame
Robert Tate
An extension for keeping game content you need on hand.
Owlbear Rodeo
Manage layers, search for items and view an outline of your scenes
Battle-System
Party-shared character sheet system for a variety of different game systems.
Customizable card deck creator with base support for 52, Tarot and D20.
GravityDeficient
Attach links to characters, mounts, and props, for sheets, docs, and more!