商业类搜索引擎及目录索引

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能源 Energy：

Energysearch - Search engine for the global energy industry.

Gridwatch.com Global Power Directory - Directory of the electric power industry covering power generation, transmission and distribution, power markets, and energy end-use.

Internet American Petroleum Exchange - Online hub for petroleum and Petrochemical websites.

Offshore Technology - Offshore oil and gas industry directories.

Oilfield Directory - Global oilfield and petroleum directory. Free business and classified listings. Discussion forum for petroleum industry.

RadWaste.org - A guide to nuclear, radioactive waste and radiation related resources on the Internet. Find radwaste related companies, research centres, regulatory agencies, government organizations, etc.

RigMatch - Search over 1000 websites in the oil and gas industry.