Directory
Published directory entries matching your search.
CubeDesk is a free online Rubik's Cube timer for speedcubers. It offers WCA-style scrambles, stats and averages, algorithm training and 1v1 racing. The project was released as a desktop app and later became a web app, and its code was made open source.
CubeSkills is a site of speedcubing tutorials developed by Feliks Zemdegs, a two-time Rubik's Cube world champion. It offers Rubik's cube tutorials for people of different skill levels, and free membership grants access to those and other content. The site states that due to work and life schedule, new videos and content are not being released, though that could change.
Cubing.net hosts a collection of Rubik's cube tools and resources by Lucas Garron and others, including timers, scramblers, algorithm trainers, a Bluetooth timer and virtual reality tools. It also links to sites for cubing software archives, notation references, podcasts and unofficial competition results, and offers subdomains to people who want to share cubing projects.
An encyclopedic collection of mathematics resources covering arithmetic, algebra, geometry, probability and trigonometry, with games, problems, puzzles and articles. It was created in 1996 by Alexander Bogomolny, who maintained it until July 2018. The Wolfram Foundation was asked to continue maintenance and updates.
Dark Site Finder is a website with a light pollution map, updated with 2022 data, intended to help users find dark skies. It also includes a listing of dark sites and blog posts about stargazing, photography and astronomical events.
The World Bank Data Catalog is a platform designed to make World Bank development data easy to find, download, use and share. It hosts 7,900 datasets, including data from the World Bank's microdata, finances and energy data platforms, as well as additional datasets from the open data catalog.
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.
DBpedia is an open knowledge graph project supported by the DBpedia Association and a global contributor community. It aggregates cleaned structured data from Wikipedia across all languages and Wikidata, providing access to more than 228 million linked entities. The project offers data, tools and services for research and industry use, and is a core resource of the Linked Open Data cloud.
De Gruyter Brill is an independent, family-owned academic publisher that states over 300 years of publishing. It offers books, journals and online resources, including more than 5,000 open access books, and provides step-by-step guides on preparing book manuscripts or journal articles for submission.
A page from the Society for Medieval Military History offering full texts of books and articles about medieval military history, republished with permission from authors and publishers. It lists books and dissertations, book introductions and sample chapters, and articles.
An illustration and concept design project by Timothy Donald Morris, an illustrator and concept designer with 20 years experience. It presents an alternate earth timeline where many sea monsters are real, set in a modern day with characteristics of the Victorian and Renaissance eras, where piracy and sea-trade are common.
DermNet is a free dermatology resource that presents evidence-based information on skin conditions, procedures and treatments. It also offers a topics A–Z, clinical images, videos and a student resource centre, with sections aimed at healthcare professionals.
Dimensions.com is a reference database of dimensioned drawings and models documenting standard measurements and sizes of everyday objects and spaces. Its resources are offered to professional designers, students, and the public. It was founded by architect Bryan Maddock and is developed through the architecture practice Fantastic Offense. Downloads are available in 2D formats (.DWG, .SVG, .JPG) and 3D formats (.3DM, .SKP, .OBJ).
A wiki collecting open source hardware, do-it-yourself biohacking, and practical human enhancement engineering projects, which together could be called transhumanism. Most of the wiki organizes and summarizes developments from publicly available hplusroadmap IRC chat logs since 2008. Topics include longevity, genetic engineering, nootropics, cryonics, and do-it-yourself biology.
DjVuLibre is an open source GPL implementation of DjVu, a format and software platform for distributing documents and images. It includes viewers, a browser plug-in for Unix browsers, command line tools for encoding and decoding, and a C++ library. The best encoders are proprietary and not included.
DL Button is a userscript that adds a Sci-Hub access button to academic article pages. It supports Google Scholar, Bing Academic, and Baidu Xueshu, and redirects CNKI English article pages to corresponding Chinese versions. Installation requires a compatible userscript manager extension such as Tampermonkey or Violentmonkey.
DM Screen is a tabletop role-playing reference page with generators for roll tables, names, riddle, shops and traps, and lists covering equipment, gods, magic items, monsters and spells. It also covers advantage and disadvantage, called shots and conditions.
Do Art Daily is a site for developing artists to track their art progress and build a drawing habit. It lists active and upcoming art challenges with start and end dates. Users can log in, submit artwork, post comments, and participate in forum discussions.
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.
DOKU.PUB is a document-sharing site where users can search for and download e-books and documents shared by the community. It states that uploaded documents are scanned with virus and malware scanners and pass a three-step approval before publishing, and that all documents are free.
Cloud-based software that converts webpages into e-books for e-readers. It is offered as a bookmarklet, browser extensions for Chrome, Firefox, Safari and Edge, a widget and an API. A Creator tool makes e-books from a text of one's own, and a WordPress plugin embeds the widget.
Drawingbooks.org provides free and open drawing and art instruction. It hosts public domain and open source art books, described as legal and free of copyright restrictions in the U.S. Titles listed include The Drawings of D. G. Rossetti, The Human Figure, Constructive Anatomy, and Book of a Hundred Hands.
DuaFile is a free platform for movies, TV series, software, games, music and eBooks. It states that titles are available instantly with no account or subscription, and that watch history and saved titles are stored locally.
Easy Auscultation is an online educational resource for learning heart and lung sounds. It offers lessons, practice drills, quizzes and a reference guide covering heart and lung sound auscultation, along with a blood pressure cuff simulator and medical terminology guides. The site states that its lung sounds training resources are free.
