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Rule System Directory
| Rule System (sort) | Publisher (sort) | Edition | Settings | Campaigns (sort) |
|---|---|---|---|---|
| D20 | 9 | 22 | ||
| D20 | 4 | 4 | 2 | |
| D20 | Saga | 4 | 18 | |
| d20 Apocalypse | Wizards of the Coast | 1st | 0 | 1 |
| d20 Future | Wizards of the Coast | 1st | 0 | 0 |
| D20 Modern | Wizards of the Coast | 1st | 2 | 3 |
| D20 OGL | 3 | 4 | ||
| D6 System | West End Games | 2nd | 1 | 6 |
| Dangerous Journeys | GDW Games | 1st | 1 | 0 |
| DC Heroes | Mayfair Games | 2nd | 0 | 0 |
| Deathwatch | Fantasy Flight Games | 1st | 1 | 6 |
| Dirty Secrets | 1 | 1 | ||
| Dragon Age RPG | Green Ronin | 1st | 1 | 14 |
| DragonQuest | Simulations Publications | 2nd | 0 | 0 |
| Dungeon Crawl Classics Role Playing Game (OGL) | Goodman Games | 1st | 0 | 10 |
| Dungeons & Dragons | 3.5 | 9 | 125 | |
| Dungeons & Dragons | 1st | 5 | 30 | |
| Dungeons & Dragons | 3rd | 5 | 5 | |
| Dungeons & Dragons | 4E | 13 | 606 | |
| Dungeons & Dragons | 3.5 | 2 | 81 | |
| Dungeons & Dragons | TSR | BCMI, Basic | 0 | 12 |
| Dungeons & Dragons | Wizards of the Coast | 5th Edition | 3 | 362 |
| Dungeons & Dragons | TSR, Inc. | Rules Cyclopedia | 0 | 4 |
| Dungeonslayers | Uhrwerk Verlag | 1st | 1 | 1 |
