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The World Data Center for Ionosphere and Space Weather, operated by NICT, preserves and distributes ionospheric and space weather data. Its holdings include Japanese and Antarctic ionospheric observations dating from 1957-1958 and space weather forecast data. Data is offered through monthly and yearly reports, ionosonde data, handwritten records, a historical viewer and a solar flare database.
A static hosting service for smallweb and retro-computing projects. It offers free subdomains, 100 MB of free space, FTP upload, predefined scripts, web mail, a search engine and a web chat, with static sites accessible from old devices.
Web Adventures offers classic text adventure games playable online in a browser without applets or plugins, and it states that Javascript is not needed. The site says it remembers where a player left a game and automatically resumes when the player returns within a month. It also presents a selection of games suited to younger players.
Caesium is a free, open source online compression tool for photos and images. It supports JPG, PNG and WebP formats, with batch processing and preview. Files are limited to 10 at a time and 20 MB per file. The tool offers quality settings and optional lossless compression that preserves image quality, with an option to keep metadata.
Web Clipper is the official Web Clipper extension for Obsidian. It lets users highlight and capture web content in a browser, and saved items are stored as durable Markdown files that can be read offline. It is available for Chromium-based browsers, Firefox, Safari and Edge.
A browser-based portal offering free online web games, listing titles such as Bloxd.io, Wormate.io, Hordes.io, Deadshot.io and Splix.io. Games are described as playable instantly in the browser with no download needed.
Web Maker is a browser-based code editor and frontend playground for building, experimenting with, and prototyping HTML, CSS, and JavaScript. It works offline as a free Chrome extension and supports SCSS, TypeScript, and Pug. It also offers real-time collaboration over a shareable link, a file tree, six layouts, CDN library support, and export to CodePen.
WebAIM works to expand the potential of the web for people with disabilities by helping individuals and organizations create accessible content. Its offerings include accessibility training, technical assistance, procurement guidance, and evaluation and reporting, alongside surveys and the WebAIM Million analysis of home pages.
WebArchive.io helps save, browse, replay, or preserve web pages and online resources.
WebcamGalore is a directory of worldwide weather webcams. It offers access to thousands of webcam feeds, previews, and archive images from global locations. Webcams are organized by region, including Europe, North America, South America, Central America and the Caribbean, Africa, Asia, Australia and Oceania, and the Antarctic and North Pole. Additional categories cover webcams on cruise ships, specialty sites, and Earth orbit.
WebCEO is an all-in-one SEO platform offering 24 online SEO tools for digital marketing, including keyword research, rankings, audits, backlink monitoring, link building and competitor research. It provides team collaboration, task management and branded SEO reports. A 14-day free trial is offered, and plans start from $99 per month.
WebCode is a site by the Webcode Team that offers code generators for developers and publishes statistics articles on topics such as HTML, CSS, JavaScript, TypeScript, Python and C#. The listings show articles dated 2026, including TypeScript adoption and market share surveys.
WebCRX is a Chrome extension utility designed to let users easily and safely install local CRX files in Chrome, with built-in permissions management. It is an independent tool with no affiliation to Google or the official Chrome Web Store, and offers support and contact options for users.
WebExtension.ORG offers free web-hosting space for browser-based open-source applications, with product pages that update release notes and fetch bug reports from github.com. It also provides anonymous bug reporting, RSS feeds for products connected to addons.mozilla.org, and technical support for hosted developers. The site states it is in transition as add0n.com migrates to webextension.org.
WebFreeHosting.net offers free web hosting with PHP, MySQL, Perl and CGI-BIN support, POP3 email, FTP and a file manager, and states that accounts do not expire. It also lists paid shared hosting plans alongside its free plan.
A page for building and installing a firmware containing a port of the nofrendo NES emulator on the NumWorks calculator. It requires an official firmware upgrade and works only with the old hardware revision (N100). Users choose a ROM and a base firmware, then upload via USB.
WebODM is free and open source drone mapping software that runs on a computer, including offline. It generates georeferenced orthomosaics, point clouds, digital elevation models, textured 3D models and gaussian splats from aerial images, with support for volume and area measurements and NDVI indexes.
webOS Homebrew is a project for LG webOS TVs that offers a Homebrew Channel to discover and install apps, along with apps such as Kodi, Moonlight, RetroArch and screensavers. Instructions cover rooting the TV or installing apps via Developer Mode without root. Mods are described as available for rooted TVs only.
The WebQC Balance Calculator is an online tool for balancing chemical equations, offering step-by-step solutions by inspection and by the algebraic method. It also reports reaction type, stoichiometry and limiting reagent. Users enter an equation or reagents and click to balance.
Webrecorder provides open source solutions for archiving the complex, interactive web. Its tools include a free Chrome extension and desktop app for archiving while browsing, and ReplayWeb.page for viewing and embedding WARC or WACZ files. It also offers Browsertrix, a cloud-native archiving platform with a 7-day free trial of the Starter plan.
Webscout provides intelligence on IP addresses for defenders of democracies and critical infrastructure. Its platform ingests network and intelligence feeds, adds context, detects threats, and supports investigation and response. It enriches IPs with data on geolocation, network ownership, VPNs, Tor, residential proxies, and provider attribution, delivered by API, bulk feed, or SIEM integration. It also offers honeypots and domain intelligence.
WebSlides is a tool for creating HTML presentations with CSS. Each parent in the #webslides element is an individual slide, and the markup uses intuitive naming conventions. The site offers 120+ premade slides, 40+ components, and 500+ SVG icons, and requires basic knowledge of HTML. It is available as a free download on a pay-what-you-want basis.
RoboGUI Ultimate (Fluent) is a graphical interface for configuring Robocopy operations. It offers quick presets for mirror, backup, move and sync tasks, plus options for file selection, operation mode, copy and directory flags, exclusions, size and age limits, retries, and log files. A batch queue is also shown.
Weill Cornell Medicine is a New York City institution engaged in patient care, research and education of physicians and scientists. It offers MD and graduate degree programs and conducts research on conditions such as cancer and cardiovascular disease, with collaborators including Cornell University and programs abroad.
