The Wheel of Time Roleplaying Game
The Wheel of Time Roleplaying Game was a roleplaying game that utilized mechanics from the new Dungeons and Dragons game, in 2001. It was published by Wizards of the West Coast and came with a Sourcebook manual that included a great deal of information not found elsewhere. Some of this, such as the fighting abilities of various characters and limits on using the Power are clearly designed to make the world fit within a d20 D&D scenario, but other aspects it is less clear. Essentially, there are several areas where we have accepted the content as canonical, or potentially canonical.
1) History of Nations: For many of the modern nations, the book includes some details on their founding, including who the first King or Queen was. It seems likely that this is from Robert Jordan, as, for example, it explains that in the early history of Tarabon, the Panarch was the opposite sex to the primary ruler, who could be a King or Queen. This then explains the apparent inconsistancy in Panarch Farede being male.
2) Objects of the Power: Many ter'angreal are described. Several of these are from the books, whereas others are not. Several angreal and sa'angreal are also described. Most of which appear in the books. Vora's Sa'angreal however, is merely referred to as the White Wand.
3) Weaves Many weaves are described, some of which occur in the books, others have not been mentioned.
An introduction, by Robert Jordan
Chapter 1: Abilities
Chapter 2: Backgrounds
Contains information on physical characteristics and personality traits of the different nationalities
Chapter 3: Classes
Chapter 4: Skills
Chapter 5: Feats
Chapter 6: Heroic Characteristics
Chapter 7: Equipment
Chapter 8: Combat
Chapter 9: The One Power
Information on a number of weaves
Chapter 10: Gamesmastering
Chapter 11: Encounters
Chapter 12: The Westlands
Chapter 13: Other Worlds
Chapter 14: Wondrous Items
angreal, sa'angreal and ter'angreal