DevDocs
devdocs.io
One fast search box across a hundred API references, usable offline
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devdocs.io
One fast search box across a hundred API references, usable offline
drugs.com
Lists the interactions between the medicines, supplements and alcohol you enter
fileinfo.com
Tells you what a mystery file extension is and what opens it
fdc.nal.usda.gov
The USDA's laboratory-measured nutrient data for tens of thousands of foods
medlineplus.gov
Plain-language health information from the US National Library of Medicine
rapidtables.com
Unit, number-base and colour conversions with the formula written underneath
wikipedia.org
Gets you oriented on almost any subject, with the sources listed at the bottom
wolframalpha.com
Answers a maths, science or unit question typed as an ordinary sentence
Cuts across
A tag is orthogonal to the category tree — that is what makes it worth having.