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- Rule Systems
Rule System Directory
| Rule System (sort) | Publisher (sort) | Edition | Settings | Campaigns (sort) |
|---|---|---|---|---|
| XPG | Deep7 | 1st | 2 | 1 |
| X-Plorers | Brave Halfling Publishing | 1st | 0 | 0 |
| Wuxia Action System | Eos Press | 1st | 1 | 0 |
| Wushu Open | saberpunk.net | Reloaded | 0 | -1 |
| Wushu | Dan Bayn | 1st | 0 | 0 |
| Witch Hunter: the Invisible World | Paradigm Concepts | 1st | 1 | 1 |
| Warhammer Fantasy Roleplay | Games Workshop | 1st | 1 | 7 |
| Warhammer Fantasy Roleplay | Black Industries | 2nd | 1 | 12 |
| Warhammer Fantasy Roleplay | Fantasy Flight Games | 3rd | 1 | 15 |
| Warhammer 40k Roleplay | 3 | 42 | ||
| Warhammer 40k | Games Workshop | 6th | 0 | 1 |
| Unknown Armies | Atlas Games | 2nd | 1 | 1 |
| Unisystem | Eden Studios, Inc. | 1st | 2 | 5 |
| Ubiquity | 1 | 2 | ||
| Twilight 2000 | Game Designers' Workshop | 1.0 | 1 | 1 |
| Tunnels & Trolls | Flying Buffalo | 5.5 | 0 | 0 |
| True20 / Blue Rose | 1st | 1 | 0 | |
| True20 | 1st | 1 | 3 | |
| Traveller | Imperium Games | T4 | 0 | 3 |
| Traveller | Imperium Games | Classic | 1 | 5 |
| Toon | 1st | 1 | 1 | |
| The One Ring | Cubicle 7 | 1st | 1 | 8 |
| The Mountain Witch | timfire publishing | 1st | 1 | 0 |
| The Dark Eye (Das Schwarze Auge) | Ulisses Spiele | 4th | 2 | 18 |
| The Adventurer's Arts | The Adventurer's Arts | 1st | 0 | 0 |
