Maxwell's Demon 

A nice and entertaining game that has a bit of science behind it. It requires really good reaction from the player, and is fun just to watch. Save the World - help little Demon to separate color flying atoms into different rooms, as fast as possible.
games maxwell daemon law physics free demon online bubble download shareware arcade puzzle

CYTSoft Psychrometric Chart 

A must have for HVAC engineers! This is an interactive and intelligent psychrometric chart program for HVAC industry. This software helps engineers solve problems involving moist air as quickly and as precisely as possible.
psychrometric chart hvac psychrometrics heating ventilation air conditioning refrigeration moist humidity calculate cytsoft