Aerofiles (Popularity: )

Research and reference site about American aviation from 1903 to present.
Category: Science\Aeronautics and Aerospace\Aviation

Aerofiles (Popularity: )

Aviation history reference site with thousands of US aircraft types, some with pictures.
Category: Science\Technology\Aerospace\Aeronautics

Berkeley National Laboratory (LBNL) Simulation Research Group (Popularity: )

Specialize in creating building energy simulation software. Building Energy Simulation Programs: DOE-2, EnergyPlus, and SPARK.
Category: Science\Technology\Energy\Conservation