Bootstrap is an open source design system and frontend toolkit for building web projects. It provides a prebuilt grid system and components, customization with Sass, and JavaScript plugins. The site also lists versioned documentation for Bootstrap 3, 4, 5 and a 6 alpha release.
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BoredButton is a website centered on a red button; clicking it takes visitors to one of hundreds of interactive websites selected to alleviate boredom. The site presents itself as a remedy for people who say they are bored.
BoredReading is described as a curation of articles from around the internet. The site presents articles in topical categories including startups, life, history, science and technology, links to sources such as SatPost and Platformer, and offers a reading list for adding and removing articles.
BORIS Portal is the Bern Open Repository and Information System. It uses Anubis, a proof-of-work based protection tool designed to prevent large-scale AI scraping of the site, which may cause temporary downtime for visitors.
Brackeys is an educational site offering free tutorials for learning game development. It states that videos are free to watch and are intended for all skill levels. It also offers downloadable premade assets and a Discord community for contacting fellow game developers.
Brainkit is a reference site that collects cognitive biases, decision tools, illusions, paradoxes and psychological experiments, presenting them as material on how the human brain works and how life situations might be improved by knowing about them. It states its content was generated by ChatGPT-4 and is for informational purposes only.
BreezeWiki makes wiki pages on Fandom readable by removing ads, videos, and suggested content. Users replace "fandom.com" with "breezewiki.com" to view a page. It is available on several independently run mirror sites, so other mirrors still work if one is offline. It does not allow editing or writing new pages and is not presented as an alternative to Fandom.
BreyerHorseRef is a collector reference site for Breyer model horses and animals, not affiliated with Breyer or Reeves International. Its database lists over 9,600 models with details such as size, mold, color and model number. Members can build in-search-of, private collection and horse showing lists, export PDF and CSV files, and list models for sale. Membership costs $35 a year.
Brickset is a database of LEGO sets and an online community of LEGO fans. Its database contains information about minifigs, parts, colours and set inventories, and the site also maintains lists of discounts and new products at online LEGO retailers. It publishes news and reviews of new products.
Bridgy Fed is an open source bridge connecting the fediverse, web sites and blogs, and the Atmosphere (Bluesky). Users can follow people on other networks, see their posts, and reply, like and repost them, with interactions working in both directions as much as possible. The service is described as free and non-commercial.
An online tool that checks websites and blogs for dead links without sign-up or downloads. It tests internal and external URLs, shows HTTP error codes, and displays where bad links appear in the HTML. The free version is limited to 3000 pages, with no limit on hyperlinks within those pages.
BrokenSilenze is an urban entertainment forum for watching and chatting about episodes of TV shows, with users sharing thoughts while indulging in TV escapism. The site lists episodes and air dates for series.
winstall is a browser-based interface for Microsoft's Windows Package Manager (winget). It lets users browse the winget repository, select multiple apps, and generate an install script that can be pasted into a terminal. The site also lists curated packs of apps that can be installed as a set.
BROWSEO is a web app for viewing web pages without distracting styles and with SEO-relevant parts highlighted. It requires no download or installation; a URL is entered to start. The output focuses on pure HTML similar to what search engines see, with toggles for elements such as server response code, headings, links and META information.
Brunei Open Data Portal is a government site that lists datasets, including statistics on government employees, the Consumer Price Index and retail prices. It reports 686 datasets available and shows recently uploaded datasets with their file counts.
BuffBook is a free, evidence-based guide to muscle hypertrophy and resistance training, structured into eight chapters. It covers muscle growth biology, exercise selection, programming variables and nutrition. The site states the content will never be paywalled, while custom coaching plans are offered as an optional shortcut for those who do not want to learn the material themselves.
bugfree.ai is an interview preparation site for software engineering roles, covering system design, object-oriented design, data and behavioral questions. It provides guided walkthroughs, example answers and AI-powered feedback, plus real interview experiences.
Build List is a directory of on-demand manufacturers for creative projects, organized by region. Listed sites offer instant quotes or online ordering so users can upload project files and see cost and production time. Services are grouped under 3D printing and laser cutting/engraving for Asia, Africa, Europe, the Americas and Oceania.
BuildGDX is a port of classic Build engine games including Blood, Duke3D, Shadow Warrior, Redneck Rampage, Witchaven and Tekwar. The site hosts version notes for releases up to v1.18, which adds palette emulation options and Windows XInput gamepad support, plus an ART files editor.
BumpWorthy is an encyclopedic archive of Adult Swim bumps and their music. After twenty years, the original site was frozen and archived by its operator, who notes that a community recorded, identified, tagged, and cataloged thousands of clips and their music. Downloads and the forum are no longer available, but every collected bump can still be browsed and watched in a browser. The community now operates on an existing subreddit.
BurdaStyle is a community website for people who sew or would like to learn how. The site offers PDF sewing patterns, and a newsletter subscription is promoted with a discount on those patterns. The homepage states the website is currently experiencing some technical difficulties.
The Bureau Central de Magnétisme Terrestre provides ground-based geomagnetic observations and data products. It operates the French National Magnetic Observatory at Chambon-la-Forêt, a network of 18 overseas observatories and 11 repeat stations in metropolitan France. The site offers collected raw magnetic measurements and derived data products, with Digital Object Identifiers for variation and definitive data.
Butternut AI is an AI website builder for small businesses that generates a site from a business name and description. It includes hosting, SSL, a free custom domain for the first year, SEO features, an AI blog writer and an AI chatbot, with Starter and Pro plans.
Buzzly.art is an art community site showing latest and featured artwork, with posts tagged by themes such as characters, fan art and original characters. The homepage lists Halloween 2026 and other drawing events.