There aren't terribly many non fighter feats which make you better at fighting. Astonishing, I know!
Off the top of my head, however, making fighters able to grab any sort of general feats means you'll see a whole lot of dipping going on.
Actual Fighter Builds:
A pure fighter is probably better at being a Soulborn than the actual Soulborn is, if he can spend all his feats on incarnum related shenanigans.
A /weird/ (but possibly effective) fighter would use fighter bonus feats for possibly some of the odder feat chains, like Aberrant Blood, or Willing Deformity. This would let you get 15 feet of reach barehanded by level 2, if you were human (though you would be slightly odd looking)
A pure fighter could do some interesting things, perhaps, with all the [Psionic] feats lying around. With Wild Talent, Deflective Armor, Psionic Meditation, Psychic Meditation, Deep Impact and a Deep Crystal Weapon you have a very interesting sort of fighter. But you probably just want a warblade or a psywar for that sort of flavor.