We have recently completed a MediaWiki update - There are a few issues that shall be ironed out in the coming day. Please be patient with any current errors.
SRD:Greater Two-Weapon Fighting
From D&D Wiki
|This material is published under the OGL|
Greater Two-Weapon Fighting [General]
You get a third attack with your off-hand weapon, albeit at a –10 penalty.
An 11th-level ranger who has chosen the two-weapon combat style is treated as having Greater Two-Weapon Fighting, even if he does not have the prerequisites for it, but only when he is wearing light or no armor.