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E4C provides a forum to connect, collaborate, solve challenges and share knowledge among a community of engineers, technologists, social scientists, NGOs, local governments and community advocates, who are dedicated to improving the quality of life for underserved communities in aspects of water, energy, health, housing, agriculture, sanitation, ICT and transport. It contains free Webinars and Solutions Library
Its Solutions Library platform compiles contributions of engineering and design solutions for designers, manufacturers and implementers of technology for underserved communities. Registration is free.
Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace for various subjects in science, maths, engineering, computer programming, economics and more.
An Open Access textbook environment is under constant revision by students, faculty, and outside experts to supplant conventional paper-based books. The LibreTexts project is currently directed by UC Davis Professor and founder Delmar Larsen.
Textbook Revolution is a student-run site dedicated to increasing the use of free educational materials by teachers and professors. On this site you'll find links and reviews of textbooks and select educational resources. Some of the books are PDF files, others are viewable online as e-books, or some are simply web sites containing course or multimedia content.
Wolfram|Alpha helps you to get knowledge and answers by doing dynamic computations based on a vast collection of built-in data, algorithms and methods. It covers wide ranges of subjects including chemistry, food & nutrition, life sciences, engineering, money & finance, socioeconomic data, computational science.
A comprehensive suite of Online calculators for Units Conversion, Wire and Sheet Gauge, O-Ring, Spring, Hardness, Decimal, Beam, Reynolds Number, Single Degree of Freedom Vibration, Stress Transformation, Principal Stress, Failure Criteria, Pipe Friction, Venturi Flow, Radiation and Elastic Constants.