Amazing PDF Viewer
Honestly the best PDF viewer I have used; you can set it so the page numbers match the printed ones. So fucking useful for rulebooks.
Maps
Create locations visually and connect them to story elements.
Characters
Track attributes, relationships, and evolving lore.
Freeform Questing
Design branching adventures without losing structure.
Sessions
Notes, dice rolls, and campaign history in one workspace. This is a crazy big feature; supports auto initiative handling, dice rolling bla bla bla...