Quote from: BalbinusLevels
Escalating ablative hit points
Alignments
Classes, in particular fighters, thieves, warrior priests and non-religious magicians
Fire and forget spells

DnD is full of details which aren't particularly generic and give it a flavour all its own.  Now, odds are so would any generic fantasy system, but DnD certainly has plenty of things that recognisably make it DnD.

To be honest, if you look at 3e and compare it to past editions, the stuff that survived was the stuff that makes DnD DnD, and by and large they're not particularly generic fantasy things.

I don't see it quite the same way. At least in the spirit of the original post, I think what we're looking for is a way to separate D&D from D20 and then rebuild a "bog-standard" fantasy game around the D20 part.

Now, this is a little hard since if I'm not mistaken, D20 implies use of either the D&D PHB or the D20 Modern PHB. And I think the D&D PHB likely contains a lot of "D&Disms". Even if you just work from the OGL SRD (which you can find in html form here thanks to John Kim), it still has a lot of assumptions carried over from D&D, such as the Cleric and the Monk class.

Nevertheless I'd say that levels, escalating ablative hit points, and classes aren't so specifically "D&D" that they can't be abstracted out. Sure, other games that use those mechanics (such as Talislanta or Palladium) probably did so under the influence of D&D, but I don't think that makes those mechanics part of the "D&D world" any more than elements of combat such "I swing/you swing", "roll to hit/roll damage". Similarly even though many games use pure skill systems, that doesn't mean they're all set in Glorantha.

Gotta agree with Conan.  It's not D&D, yet quite definitively a d20 fantasy game.

I add my vote to the Conan option, though Black Company could do a fine alternative.

Monte Cook's Arcana Evolved stuff maybe?

Green Ronin's Medieval Players Manual may come close, if we're talking a pseudo-medieval fantasy setting.

I'd say if someone took the SRD, and included OGL material like, say, True Sorcery or the Conan magic system, and then retooled some of the monsters a bit to better fit their descriptions in myth and fantasy - manticores with scorpion tails, the word gorgon referring to what is now called the medusa, etc. - then you'd get even closer.