National Renewable Energy Laboratory (NREL) - research and development of renewable fuels and electricity that advance national energy goals to change the way we power our homes, businesses, and cars

International Solar Energy Society (ISES) - a global solar energy allianse. ISES has been serving the needs of the renewable energy community. The Society supports its members in the advancement of renewable energy technology, implementation and education all over the world.

The Astrophysics Data System (ADS) - NASA-funded project which maintains three bibliographic databases containing more than 5.8 million records: Astronomy and Astrophysics, Physics, and arXiv e-prints