Tagged “reference”
285 pages · most loved first · page 9 of 12
PidgiWiki
A video game wiki with a strong focus on game artwork, collecting sprites, renders, and other image assets alongside inf…
PlanetMath
A community-written mathematics encyclopedia whose entries are written and reviewed by members, browsable by subject ind…
Planning Tank
A knowledge base on urban, regional, and rural planning for students and professionals, with articles on cities, environ…
Plant Smart
A searchable guide to which plants are safe or toxic for cats and dogs, built to answer the frantic question of whether…
PopeHistory.com
A reference guide profiling every pope from Saint Peter onward, with short biographies covering their reigns, wars, scan…
Ptable
A richly detailed interactive periodic table with properties, electron configurations, isotopes, compounds, 3D orbitals…
PubChem Periodic Table
An interactive periodic table from PubChem where each element opens a page of properties, isotopes, history and compound…
RANDOM.ORG
A true random number service powered by atmospheric noise since 1998, with dice rollers, list shufflers, and coin flippe…
Refdesk
A long-running, family-friendly index of reference resources, fact checkers, dictionaries, maps and quality links across…
RefSeek
An academic search engine for students and researchers that pulls results from web pages, books, encyclopedias and journ…
Religion Compare
A reference site answering common comparative questions about belief, ritual, and practice across the world's major reli…
RhymeZone
A rhyming dictionary and word-finder that returns rhymes, near rhymes, synonyms, homophones, and famous quotations for a…
RimWorld Wiki
The community wiki for the colony-sim RimWorld, with detailed pages on pawns, items, biomes, events and mechanics for pl…
Rocket & Space Technology
A detailed self-published reference on orbital mechanics, rocket propulsion, and spacecraft engineering written by an ae…
RosettaGit
A community site that presents solutions to the same programming task in as many languages as possible, from FizzBuzz to…
Rulers
A reference database of heads of state and government for countries and territories around the world, past and present,…
SCA College of Arms
The heralds' home for the Society for Creative Anachronism, with guides, rules, articles and archives on medieval-style…
Scale Types Tutorial
A tutorial from the International Society of Antique Scale Collectors that introduces the main types of weighing scales,…
ScriptSource
A reference database describing the world's writing systems, scripts, and characters, aimed at helping people identify a…
Seaforces Online
Naval information with photos and details on US Navy ships and aircraft, from carriers to submarines and many other navi…
SeatGuru
An airline seat-map database that rates every seat on hundreds of aircraft, flagging which ones have extra legroom, no r…
Sheldon Brown's Bicycle Technical Info
A beloved, encyclopedic archive of bicycle repair and maintenance knowledge compiled by a legendary bike mechanic and wr…
Silva Rhetoricae
A comprehensive online guide to classical and Renaissance rhetoric, cataloguing hundreds of rhetorical figures and devic…
Simply Psychology
A reference site explaining core psychology theories, studies, and famous experiments in clear language for students and…
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