All Thermodynamics - from HyperPhysics portal. This is rather a comprehensive online physics handbook containing "Thermodynamics" chapter. Site has a handle navigation, good illustrations, and very detail content.

Applied Thermodynamics - Definition and short explanations of terms, units and basic principles.

Basic Terms and Theory - from Engineers Edge. A definitions, short explanations and connection of basic thermodynamics terms.

Computational Thermodynamics - Calculation of metal phase diagrams using the CALPHAD method. Also offers consulting services.

The Expert System For Thermodynamics - TEST is a visual environment to solve thermodynamics problems, pursue what-if scenarios and perform numerical experiments.

Fundamentals of Thermodynamics - Lecture notes and problems from University of Pittsburg.

Ideal Gas Law - Applet illustrating the ideal gas law : action of a piston in a pressure chamber filled with ideal gas.

Mass, Energy, and Freedom - The Coins of Thermodynamics - The basis for thermodynamics. An introduction to the conservation of energy, states of matter and changes of state.

Properties of Heat and Matter - Online book on Thermodynamics at UC Berkeley.

The Second Law of Thermodynamics - A qualitative introduction to the second law and entropy written for beginners in chemistry but useful for physics students too. Explains relationship with Murphy's Law.

Thermodynamic Toys - Contains directions for making toys with thermodynamics background.

Thermodynamics and Its Applications - Companion site to the textbook by J. W. Tester and M. Modell, includes answers to selected problems and current errata.

Thermodynamics by Professor Z. S. Spakovszky - Basic thermodynamics course accompanied by lecture notes.

Thermodynamics Research Laboratory - Research at the University of Illinois at Chicago is focused on nanobiotechnology, statistical mechanics and thermodynamics of complex systems and molecular based studies.

What is Thermodynamics? - Controlling variables in energy/heat systems. Thermodynamics discussed in the context of propulsion.