Phase Diagrams

Computational Thermodynamics Inc.
Computational Thermodynamics Inc. is a US-based Company specialized in providing consulting services in the fields of computational thermodynamics and computational kinetics using Thermo-Calc and DICTRA.
University of Southampton
Introduction to phase diagrams for those new to the subject.
University of Cambridge
Flash tutorial for beginners.
Introduction to Phase Diagrams
One of the 'Materials Science on CD-ROM' series from Matter, a non-profit consortium of UK materials science departments.
CALPHAD
Computer Coupling of Phase Diagrams and Thermochemistry, aims to promote computational thermodynamics.
IUPAC Project
Thermodynamics and non/equilibrium criteria for development and application of supplemented phase diagrams
University of South Florida
Phase Diagrams of Pure Substances - Tutorial
PSIgate
Big list of Phase Diagram links.