Blades of Purpose

From publisher blurb:

Intelligent Items for Classic Fantasy

While the d20 rules have expanded the rules for intelligent weapons to include any item, most such items revealed so far have remained ancient weapons with narrowly focused personalities. Blades of Purpose provides not only intelligent weapons but aso armor, cloaks, and jewelry.

Several intelligent items of all types, ages and personalities, including the Moon's Edge and the Magus Gem.
Thorough backgrounds, histories and roleplaying notes.
Items suitable for both heroes and antagonists, for use as treasure or challenges.