PMP® Resources
 
PMI® Resources
PMBOK® Guide - Sixth Edition (Free with PMI Membership)
PMP® Study Guides
CAPM® Study Guides
Test Simulators / Online tools
PMP Simulator (For CAPM as well)
Professor ITTO Simulator (For CAPM as well)
ITTO Navigator (For CAPM as well)
PMP Process Game (For CAPM as well)