Glaive (PH p117) 2Hand 1d10 20 / x3 — S 8 gp 10 lbs 5 10 Reach 10’, Polearm
Naginata (DR331 p24) 2Hand 1d10 20 / x3 — S 10 gp 15 lbs 5 10 Reach 10’, Polearm
Voulge (DR331 p24) 2Hand 1d10 20 / x3 — S 10 gp 14 lbs 5 10 Reach 10’, Polearm
Greatspear (CWar p156) (CAdv p116)+ 2Hand 2d6 20 / x3 10’ P 25 gp 9 lbs 5 10 Reach 10’, Polearm Shared Focus (Longspear)
Lochaber Axe (DR331 p24) 2Hand 1d10 20 / x3 — S 18 gp 15 lbs 5 10 Reach 10’, Trip, Polearm
Longaxe
(CAdv p115) 2Hand 1d12 20 / x3 — S 35 gp 15 lbs 5 10 A proficient user with Power Attack that shifts at least 3 points to damage can use the Longaxe as Reach 10’ for the whole round Shared Focus (Greataxe)
Longspear, Microlith Barbed (DR331 p84) 2Hand 1d10 20 / x3 — P 5 gp 9 lbs 5 10 Reach 10’
Pincer Staff (Und p64) 2Hand 1d10 20 / x2 — B 20 gp 15 lbs 5 10 Reach 10’, Grapple
Poleaxe, Heavy (CWar p156) (CAdv p116)+ 2Hand 2d6 20 / x3 — P or S 20 gp 15 lbs 5 10 Reach 10’, Vs. Charge, Polearm Shared Focus (Halberd)
Sharrash, Talenta (Eb p120)(EbEratta)+ 2Hand 1d10 19-20 / x2 — S 18 gp 10 lbs 5 10 Reach 10’, Trip, Polearm
Sugliin (Frost p76) 2Hand 2d8 20 / x2 — S & P 35 gp 20 lbs 10 10 Reach 10’ Single attack requires a Full Round Action unless you also have Feat: Sugliin Mastery.
Warpike, Dwarven (RoS p155)(DR331 p24) 2Hand 2d6 20 / x3 — P or S 45 gp 15 lbs 5 10 Reach 10’, vs. Charge, Trip, Polearm
Best Answer
Dungeon vol. 120 has the braid blade, an exotic weapon that allows a proficient user to tie it into their hair and make an extra attack with it at −5 during any full-attack. By “extra” I mean over and above iteratives, two-weapon fighting, haste, etc. That property makes it quite good, and fairly well worth the Exotic Weapon Proficiency feat.
Note that the article fails to give braid blades any kind of limit. As written, you can tie as many of them as you like into your hair, and then make that many attacks. For the sake of your game, I strongly recommend limiting that to one (whether officially, as DM, or unofficially, as a player just not buying more than one).
I am reasonably certain this is the only such weapon in D&D 3.5e.