Wolfram|alpha is more than a search engine. it gives you access to the world's facts and data and calculates answers across a range of topics, including science, nutrition, history, geography, engineering, mathematics, linguistics, sports, finance, music...
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Links to free computer, mathematics, technical books all over the world, directory of online free computer, programming, engineering, mathematics, technical books, ebooks, lecture notes and tutorials. very well categorized. equipped with both pattern and keywords search engines.
Links to free programming, computer, mathematics, technical ebooks and lecture notes all over the world, directory of online free programming, computer, engineering, mathematics, technical books, ebooks, lecture notes and tutorials. very well categorized. equipped with advanced search engines.
Creative commons licenses provide a flexible range of protections and freedoms for authors, artists, and educators.
Library genesis is a scientific community targeting collection of books on natural science disciplines and engineering.