GameFAQs: Ultima IV: FAQs, walkthroughs and town script.
Optima IV: A Virtual Basic clone of Ultima III and IV. With game design information, screenshots and download. Source and additional modules are available.
Ultima IV Solution: Bare-bones walkthrough including all essential steps and items, by Stephen Lee.
Ultima IV Website, by Samson Dragon: Provides walkthroughs, maps, and utilities.
Ultima IV: Gaining Virtue: List of actions that alter your virtue in the game.
Ultima IV: Quest of the Avatar: Origin's official site. World and dungeon maps, walkthough, documentation, and music files.
Ultima IV: The Dawn of Virtue: A fan remake project with 3D rendered isometric graphics.
Ultima Personality Test: Virtue based class-determination questions, game crib sheet, and character files.
xu4 - Ultima IV Recreated: A remake of the classic computer game Ultima IV for modern operating systems.