The Merck Index Online is a reference source on chemicals, drugs and biologicals, containing over 12,000 monographs. It has been updated by the Royal Society of Chemistry since 2013 and is continuously expanded with expert-curated content highlighting relevant literature and patents.
PassMedicine provides free UCAT revision with over 3,000 practice questions covering Verbal Reasoning, Quantitative Reasoning, Decision Making and Situational Judgement. The interface is designed to mirror the real exam, and users can compare their scores with others and discuss individual questions. A six-month subscription option is listed as free.
A datasheet search service covering more than 900,000 electronic component datasheets from manufacturers. It offers technical specifications, electrical characteristics, package details and PDF documents for semiconductors, ICs, MOSFETs and other components, and allows checking equivalents with daily updates.
Doc Brown's School Science Revision Notes and Quizzes is a science revision website that began in 2000 as a chemistry site and has since expanded. It offers revision notes and quizzes for biology, chemistry and physics at lower secondary, GCSE, IGCSE and advanced level, keyed to UK exam boards including AQA, Edexcel, OCR, WJEC and CCEA.
MathPortal is a mathematics website offering step-by-step online calculators and solvers for topics including polynomial equations, rational expressions, systems of equations, matrices, complex numbers and analytic geometry. It also provides math lessons, formulas and tests. The site states it was designed by mathematician Miloš Petrović, who wrote the calculators, lessons and formulas. A paid homework help service is mentioned.
Airfoil Tools provides tools to search, compare and plot airfoils. It includes an airfoil search with filtering by thickness and camber, a plotter, shape comparison, NACA 4 and 5 digit generators, and a Reynolds number calculator. Users can add their own airfoils, but these are stored only in the browser session.
Wolfram MathWorld is a comprehensive encyclopedia of mathematics with 13,000 detailed entries. It is continually updated, extensively illustrated, and includes interactive examples, covering areas such as algebra, geometry, calculus and analysis, and probability and statistics.
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PassMedicine provides free UCAT revision with over 3,000 practice questions covering Verbal Reasoning, Quantitative Reasoning, Decision Making and Situational Judgement. The interface is designed to mirror the real exam, and users can compare their scores with others and discuss individual questions. A six-month subscription option is listed as free.
A datasheet search service covering more than 900,000 electronic component datasheets from manufacturers. It offers technical specifications, electrical characteristics, package details and PDF documents for semiconductors, ICs, MOSFETs and other components, and allows checking equivalents with daily updates.
Doc Brown's School Science Revision Notes and Quizzes is a science revision website that began in 2000 as a chemistry site and has since expanded. It offers revision notes and quizzes for biology, chemistry and physics at lower secondary, GCSE, IGCSE and advanced level, keyed to UK exam boards including AQA, Edexcel, OCR, WJEC and CCEA.
MathPortal is a mathematics website offering step-by-step online calculators and solvers for topics including polynomial equations, rational expressions, systems of equations, matrices, complex numbers and analytic geometry. It also provides math lessons, formulas and tests. The site states it was designed by mathematician Miloš Petrović, who wrote the calculators, lessons and formulas. A paid homework help service is mentioned.
Airfoil Tools provides tools to search, compare and plot airfoils. It includes an airfoil search with filtering by thickness and camber, a plotter, shape comparison, NACA 4 and 5 digit generators, and a Reynolds number calculator. Users can add their own airfoils, but these are stored only in the browser session.
Wolfram MathWorld is a comprehensive encyclopedia of mathematics with 13,000 detailed entries. It is continually updated, extensively illustrated, and includes interactive examples, covering areas such as algebra, geometry, calculus and analysis, and probability and statistics.
