Derulbaskul
Adventurer
My absolute favourite was an is the Forgotten Realms. That said, I think we're spoilt for choice:
- Midnight is simply outstanding but, of course, a different style of game.
- Greyhawk, as published in the Living Greyhawk Gazetteer, was excellent.
- Kingdoms of Kalamar has some of the best support products ever (the atlas, DM's screen, the city guide to Geanavue) but be advised that any rules-based stuff is, um, crap. But I love the atlas.
- Last but not least, Golarion. There is a simple reason they have such devoted fans: their stuff really is good.
The OP mentioned Mongoose's Conan. It's a great setting, and quite a good take on the d20 ruleset, but, as always, it's Mongoose. You can never be sure if you've got an edited and playtested product or the first draft.
- Midnight is simply outstanding but, of course, a different style of game.
- Greyhawk, as published in the Living Greyhawk Gazetteer, was excellent.
- Kingdoms of Kalamar has some of the best support products ever (the atlas, DM's screen, the city guide to Geanavue) but be advised that any rules-based stuff is, um, crap. But I love the atlas.
- Last but not least, Golarion. There is a simple reason they have such devoted fans: their stuff really is good.
The OP mentioned Mongoose's Conan. It's a great setting, and quite a good take on the d20 ruleset, but, as always, it's Mongoose. You can never be sure if you've got an edited and playtested product or the first draft.