| System (Setting) | Publications | Articles |
|---|---|---|
 d20 | 4 | 2 |
| d6 | 2 | 7 |
| D6 Adventures | 1 | 1 |
| d6-lite | 1 | 1 |
 Dagon's Bones | 1 | 1 |
| Daredevils | 2 | 5 |
| Dark Aeons | 31 | 39 |
| Dark Conspiracy | 5 | 14 |
| Dark Cults | 1 | 1 |
| Dark Places and Demogorgons | 1 | 1 |
| Dark Stars | 1 | 1 |
| Dark Streets | 8 | 38 |
| Dark Trickery | 1 | 1 |
| Darkfast Dungeons | 2 | 2 |
| dayLITE | 3 | 3 |
| De Profundis | 2 | 9 |
| Dead Man on Campus | 1 | 1 |
| Decampment | 1 | 1 |
| Delta Green | 97 | 204 |
| Dice of Arkham | 1 | 1 |
| Diceless | 1 | 0 |
| Do You Worship Cthulhu? | 1 | 1 |
| Don't Let Them Take You Alive | 5 | 25 |
| Don't Look Back | 3 | 3 |
| Don't Mess With Cthulhu | 3 | 3 |
| Don't Wake Up Cthulhu! | 1 | 1 |
| Doom Guard | 1 | 1 |
| The Doom That Came to Atlantic City | 1 | 1 |
| Dracula's Feast | 1 | 1 |
| Dream Phone of Cthulhu | 1 | 1 |
| Dream Quest | 1 | 1 |
| The Dream-Quest of Unknown Kadath | 1 | 1 |
| DreamEscape | 2 | 2 |
| Dreamlands Adventures | 1 | 1 |
| Dreams of Cthulhu | 1 | 1 |
| The Drowned Lands | 1 | 10 |
| Dungeon Crawl Classics | 12 | 31 |
| Dungeon World | 1 | 1 |
| Dungeons and Dagon | 1 | 1 |
| Dungeons and Dragons | 46 | 88 |