Tagged “reference”
285 pages · most loved first · page 8 of 12
Nutrepedia
A fast nutrition reference that gives instant nutrition facts for any food, available in 29 locales and built with Cloju…
OEIS
The On-Line Encyclopedia of Integer Sequences, a searchable database of more than 360,000 number sequences used by mathe…
Office Holidays
A calendar of public and bank holidays for countries around the world, useful for planning meetings, trips and deadlines…
Omni Calculator
A collection of more than 3,000 free calculators built with subject experts, covering everything from mortgage payments…
OneLook
A dictionary metasearch that queries dozens of dictionaries at once and includes a powerful reverse dictionary and thesa…
Online Conversion
A reference for converting just about anything to anything else, with thousands of units, millions of conversions, and c…
Ontology: Theory and History
A large reference site on ontology in philosophy, covering its history, theory and vocabulary, with sections on categori…
Open5e
A clean, fast reference for the Dungeons and Dragons 5th Edition open rules, with searchable monsters, spells, and class…
OpenFactBook
A community-maintained successor to the CIA World Factbook with free data on 260+ countries covering geography, people,…
Organic Chemistry Data
An encyclopedic collection of reference data, resources, and links for organic chemists, curated by the ACS Division of…
Organic Syntheses
A free archive of peer-reviewed, independently checked procedures for making organic compounds, a long-running reference…
Origami Database
A browsable catalogue of hundreds of origami models with high-resolution photos, difficulty ratings, and links to diagra…
Ownersman
A collection of new and old car owner's manuals from many makes that you can find and view online, handy for tracking do…
Pagat
An authoritative encyclopedia of card game rules from around the world, documenting hundreds of traditional and regional…
Paper Sizes
A free reference listing international paper sizes, dimensions, and formats in metric and imperial, from the A and B ser…
Patheos Religion Library
A peer-reviewed reference library covering the beliefs, rituals, and history of dozens of world religions and spiritual…
PCGamingWiki
An encyclopedia of PC game fixes and workarounds, listing settings, save locations, widescreen patches and known issues…
Periodex
An elegant, responsive periodic table of the elements that lets you tap any element to explore its properties, a quick a…
Periodic Table in Pictures and Words
An interactive periodic table that pairs each element with a picture and a plain-language description of where it is fou…
Periodic Table of Elements
An interactive periodic table of the chemical elements with a page for each one covering atomic properties, history and…
Periodic Table of Elements
An interactive periodic table of all 118 elements with a live temperature slider showing states of matter, element compa…
Periodic Table of Tools
An interactive periodic table of physical tools, from hammers and other hitting devices to saws and cutters, browsable b…
Photons to Photos
A data-heavy reference of camera sensor performance, with charts comparing dynamic range, noise, and other measurements…
PianoChord.io
An interactive piano chord reference where you pick a root and chord type to see the keys highlighted and hear how each…
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