Low magic, human-centric, no-alignment setting; d20 modern or D&D?

[AFGNCAAP]

Well, if you're willing to wait, there's d20 Past from WotC for one of their Q1 releases....

 

[Rodrigo Istalindir]

Two words: Grim Tales

 

[Krieg]

(Besides Grim Tales)

Folks, he is already aware of Grim Tales. He is looking for other options.