Much of it is free. Sites which maintain downloadable graphics or picture files. Sites maintained by businesses for the sale, marketing, etc. of goods or services. Some organizations may choose to include organizational publications, directories, or other useful information Amazing Environmental Organization Web Directory , organized by general classification, listing commercial organizations, products, publications, government agencies, etc. An increasing number of raw data files are available for downloading over the Internet.
Sites offering career leads for practitioners in a given discipline.
CareerScope , joblines, career guides, etc.