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href="https://web.archive.org/web/20160518210022/http://try.alexa.com/marketing-stack/?ax_atid=a8875881-b98d-4d00-ba62-160ec3241072">Features <i class="fa fa-angle-down" aria-hidden="true"></i></a> <div class="drop-cont"> <ul class="dropDown"> <li><a href="https://web.archive.org/web/20160518210022/http://try.alexa.com/marketing-stack/seo-audit-tool">SEO Audit Tool</a></li> <li><a href="https://web.archive.org/web/20160518210022/http://try.alexa.com/marketing-stack/keyword-difficulty-tool">Keyword Difficulty tool</a></li> <li><a href="https://web.archive.org/web/20160518210022/http://try.alexa.com/marketing-stack/on-page-seo-checker">On-Page SEO Checker</a></li> <li><a href="https://web.archive.org/web/20160518210022/http://try.alexa.com/marketing-stack/competitive-intelligence-tools">Competitive Intelligence Tool</a></li> </ul> </div> </div> <a class="menu-tab " href="/web/20160518210022/http://www.alexa.com/plans?ax_atid=7be51359-2328-49c8-810e-4ed12f91695a">Pricing</a> <a class="menu-tab " href="/web/20160518210022/http://www.alexa.com/secure/login?ax_atid=ea047665-f64f-4dcc-b597-203d88130673&resource=/topsites/category/Top/Reference">Log in</a> <a class="btn btn-large btn-n3 outline " href="/web/20160518210022/http://www.alexa.com/plans?ax_atid=a2db22cc-0771-47cf-af94-64295a067631">SIGN UP</a> </section> <section class="row-fluid alexa-menu mobile"> <div class="menu-tab "><a href="https://web.archive.org/web/20160518210022/http://try.alexa.com/marketing-stack/?ax_atid=a8875881-b98d-4d00-ba62-160ec3241072">Features</a> <i class="fa icon fa-angle-down" aria-hidden="true"></i></div> <div class="drop-cont"> <ul class="dropDown"> <li><a href="https://web.archive.org/web/20160518210022/http://try.alexa.com/marketing-stack/seo-audit-tool">- SEO Audit Tool</a></li> <li><a href="https://web.archive.org/web/20160518210022/http://try.alexa.com/marketing-stack/keyword-difficulty-tool">- Keyword Difficulty tool</a></li> <li><a href="https://web.archive.org/web/20160518210022/http://try.alexa.com/marketing-stack/on-page-seo-checker">- On-Page SEO Checker</a></li> <li><a href="https://web.archive.org/web/20160518210022/http://try.alexa.com/marketing-stack/competitive-intelligence-tools">- Competitive Intelligence Tool</a></li> </ul> </div> <a class="menu-tab " href="/web/20160518210022/http://www.alexa.com/plans?ax_atid=7be51359-2328-49c8-810e-4ed12f91695a">Pricing</a> <a class="menu-tab " href="/web/20160518210022/http://www.alexa.com/secure/login?ax_atid=ea047665-f64f-4dcc-b597-203d88130673&resource=/topsites/category/Top/Reference">Log in</a> <a class="menu-tab " href="/web/20160518210022/http://www.alexa.com/plans?ax_atid=a2db22cc-0771-47cf-af94-64295a067631">Sign up</a> </section> </div> </header> <section id="alx-content" class="alx-content"> <div class="row-fluid"> <header id="TopSites" class="page-banner"> <div class="content-fixed"> <section class="row-fluid"><div class="span4 notsearch"><span class="span12"><h1 class="h5">Top Sites<br class="hidden-tablet hidden-desktop"><br class="hidden-tablet hidden-desktop"></h1></span></div> <div class="span8 searchForm"><h1 class="h5"><br class="hidden-tablet hidden-desktop"><form id="" class="form-search" action="/web/20160518210022/http://www.alexa.com/siteinfo" onsubmit="$.cookie('ax_gr_last_tab', '#trafficstats', { expires: 1});" novalidate="novalidate"> <input name="q" type="url" class="input-medium search-query" placeholder="Enter a site" required> <button type="submit" class="btn btn-search">Find</button><input type="hidden" name="r" value="topsites_category"><input type="hidden" name="p" value="bigtop"></form></h1></div></section> </div> </header><section class="page-product-top"> <div class="content-fixed content-top"> <section class="page-title page-title-only"> <div class="row-fluid"> <span class="span12"> <h2 class="hdr"> <span class="page-title-text">Top Sites in: <a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top">All Categories</a><span> > </span><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference">Reference</a></span> <span class="tt"> <img src="https://web.archive.org/web/20160518210022im_/http://pcache.alexa.com/images/icons/icon_tip.4f0ae04e390da581fff1a3fa62e96860.png" width="13" height="13" alt=""/> <span class="tttooltip"> <span class="top"></span> <span class="middle">Many listings in Top Sites by Category are for specific pages or subdirectories, not for entire sites. For example, in the Reference > Maps section you'll find mapquest.com (an entire site about maps) and maps.yahoo.com (one section about maps on a larger site).<br/><br/> For this reason, the listings in the Top Sites by Category are ordered by Popularity of this listing, and not by the overall Traffic Rank of the site. We use the same basic traffic ranking technology used for Alexa Traffic Rank — a combination of users and page views — but apply it only to the traffic for that specific listing. To find out the Traffic Rank of any site in the Top Sites by Category directory, just click the name of the site and you'll be taken to the "Site Info" page for that site.</span> <span class="bottom"></span> </span> </span> </h2> </span> </div> </section> </div> </section> <section class="content-fixed page-product-content"> <span class="inner-2col tb"> <span class="tr"> <aside class="td col-nav"> <nav> <ul class="navi-list"> <li id="topsites-global" class=""><a class="" watch-hash data-sync="1" href="/web/20160518210022/http://www.alexa.com/topsites">Global</a></li><li id="topsites-country" class=""><a class="" watch-hash data-sync="1" href="/web/20160518210022/http://www.alexa.com/topsites/countries">By Country</a></li><li id="topsites-category" class=""><span class="selected ">By Category</span></li><li id="topsites-data" class=""><a class="track-atid" watch-hash data-atid="b0623f8b-e7a9-452b-bf6a-55c278273747" data-sync="1" href="https://web.archive.org/web/20160518210022/http://aws.amazon.com/alexa/"><img class="api-ad" src="/web/20160518210022im_/http://www.alexa.com/images/ads/img-topSites-API-ad.jpg"></img></a></li> </ul> </nav> </aside> <section class="td col-r"> <section id="section-category-data" class="row panel-row section-category-data"> <div id="subcat_div" class="panel-wrapper no-padding"> <header class="row panel-header"> <div class="panel-header-primary"> <h4 class="h4"> <a class="catList open">Sub-Categories ( 23 )</a> </h4> <p></p> </div> </header> <div class="categories row-fluid "> <ul class="subcategories span3"><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Almanacs">Almanacs</a> <span class="small gray">( 38 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Archives">Archives</a> <span class="small gray">( 283 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Ask_an_Expert">Ask an Expert</a> <span class="small gray">( 60 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Bibliography">Bibliography</a> <span class="small gray">( 86 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Biography">Biography</a> <span class="small gray">( 24 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Books">Books</a> <span class="small gray">( 4 )</span></li></ul><ul class="subcategories span3"><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Dictionaries">Dictionaries</a> <span class="small gray">( 913 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Directories">Directories</a> <span class="small gray">( 149 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Education">Education</a> <span class="small gray">( 31,710 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Encyclopedias">Encyclopedias</a> <span class="small gray">( 53 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Flags">Flags</a> <span class="small gray">( 492 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Journals">Journals</a> <span class="small gray">( 10 )</span></li></ul><ul class="subcategories span3"><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Knots">Knots</a> <span class="small gray">( 75 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Knowledge_Management">Knowledge Management</a> <span class="small gray">( 789 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Libraries">Libraries</a> <span class="small gray">( 2,010 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Maps">Maps</a> <span class="small gray">( 213 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Museums">Museums</a> <span class="small gray">( 4,274 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Open_Access_Resources">Open Access Resources</a> <span class="small gray">( 0 )</span></li></ul><ul class="subcategories span3"><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Parliamentary_Procedure">Parliamentary Procedure</a> <span class="small gray">( 24 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Quotations">Quotations</a> <span class="small gray">( 219 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Thesauri">Thesauri</a> <span class="small gray">( 17 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/Time">Time</a> <span class="small gray">( 57 )</span></li><li><a href="/web/20160518210022/http://www.alexa.com/topsites/category/Top/Reference/World_Records">World Records</a> <span class="small gray">( 8 )</span></li></ul> </div> </div> </section><ul> <li class="site-listing"><div class="count">1</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/stackoverflow.com">Stackoverflow.com</a> </p><div class="description"> A language-independent collaboratively edited question and answer site for programmers. Questio<span class="trucate">…<a class="moreDesc">More</a></span><span class="remainder">ns and answers displayed by user votes and tags.</span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">2</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/answers.yahoo.com">Answers.yahoo.com</a> </p><div class="description"> Ask questions and get answers from other people in the community.<span class="remainder"></span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">3</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/nlm.nih.gov">Nlm.nih.gov</a> </p><div class="description"> US national provider of health-related library and information services.<span class="remainder"></span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">4</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/wordreference.com">Wordreference.com</a> </p><div class="description"> Dictionary containing English to/from Spanish, French, German, and Italian, and a language forum.<span class="remainder">m.</span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">5</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/goodreads.com">Goodreads.com</a> </p><div class="description"> Lets users track and rate books and network with other readers.<span class="remainder"></span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">6</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/thesaurus.com">Thesaurus.com</a> </p><div class="description"> Online version of Roget's II: The New Thesaurus, 3rd edition.<span class="remainder"></span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">7</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/https://archive.org/">Https://archive.org/</a> </p><div class="description"> Nonprofit organisation established to preserve Web sites by taking regular "snapshots". The Way<span class="trucate">…<a class="moreDesc">More</a></span><span class="remainder">back Machine provides links to older versions of a webpage. There are special collections, for example on Web pioneers.</span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">8</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/blackboard.com">Blackboard.com</a> </p><div class="description"> an online education company transforming the Internet into a dynamic web-based teaching and lea<span class="trucate">…<a class="moreDesc">More</a></span><span class="remainder">rning environment for colleges, universities and organizations through course delivery.</span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">9</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/thefreedictionary.com">Thefreedictionary.com</a> </p><div class="description"> English, Medical, Legal, and Computer Dictionaries, Thesaurus, Encyclopedia, a Literature Refer<span class="trucate">…<a class="moreDesc">More</a></span><span class="remainder">ence Library, and a Search Engine all in one!</span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">10</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/https://www.udemy.com/">Https://www.udemy.com/</a> </p><div class="description"> Delivers online courses that cover many topics and interests. Fees vary.<span class="remainder"></span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">11</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/urbandictionary.com">Urbandictionary.com</a> </p><div class="description"> A veritable cornucopia of streetwise lingo, posted and defined by its readers.<span class="remainder"></span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">12</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/mit.edu">Mit.edu</a> </p><div class="description"> Admissions information, events calendar, visitor's information and news items.<span class="remainder"></span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">13</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/stumbleupon.com">Stumbleupon.com</a> </p><div class="description"> A web browser plugin that allows users to discover and rate webpages, photos, videos, and news <span class="trucate">…<a class="moreDesc">More</a></span><span class="remainder">articles.</span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">14</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/wiktionary.org">Wiktionary.org</a> </p><div class="description"> Collaborative project for creating a free lexical database in every language, complete with mea<span class="trucate">…<a class="moreDesc">More</a></span><span class="remainder">nings, etymologies, and pronunciations.</span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">15</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/https://www.coursera.org/">Https://www.coursera.org/</a> </p><div class="description"> Social entrepreneurship company that partners with top universities around the world to offer f<span class="trucate">…<a class="moreDesc">More</a></span><span class="remainder">ree courses online for anyone to take. Includes courses and list of universities.</span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">16</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/investopedia.com">Investopedia.com</a> </p><div class="description"> Investment education site that includes the most comprehensive investing dictionary on the web <span class="trucate">…<a class="moreDesc">More</a></span><span class="remainder">as well as articles and tutorials on nearly any aspect of the market.</span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">17</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/merriam-webster.com">Merriam-webster.com</a> </p><div class="description"> Publisher of American English dictionaries and reference sources.<span class="remainder"></span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">18</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/cambridge.org">Cambridge.org</a> </p><div class="description"> Information on the campuses and all areas of the printing press.<span class="remainder"></span></div> </div><br clear="all"/></li> <li class="site-listing"><div class="count">19</div><div class="desc-container"><p class="desc-paragraph"><a href="/web/20160518210022/http://www.alexa.com/siteinfo/mapquest.com">Mapquest.com</a> </p><div class="description"> Find directions and explore towns and cities worldwide. 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