Directory
Published directory entries matching your search.
The W3C Markup Validation Service is a service based on SGML and XML parsers that checks the markup validity of Web documents, including HTML, XHTML, SMIL and MathML. Documents can be checked by URI, file upload or direct input. An experimental web service API is documented, along with a user's guide and explanations of error messages.
Marp, the Markdown Presentation Ecosystem, is a toolset for creating slide decks from Markdown documents. Its format is based on CommonMark, with a ruler for splitting pages. It supports directives, extended syntax, and built-in themes, with CSS theming. Markdown can be converted into presentation-ready HTML, PDF, and PowerPoint files. The ecosystem includes Marp for VS Code and Marp CLI, and is built on the Marpit framework.
Mastofeed provides embeddable Mastodon feeds for blogs and similar pages. Users add HTML markup to display a live preview, and profile owners can opt out or override the #nobot tag with #noMastofeed or #mastofeed.
MediaPeek is a browser-based tool that inspects media metadata from a URL in a clear interface. It reads only the bytes needed via byte-range HTTP requests and can look inside ZIP and TAR archives without full extraction. It runs metadata analysis through mediainfo.js in WebAssembly, exports results in several formats including JSON, object, text, HTML and XML, and shares results through encrypted links without storing content.
A browser-based tool that generates HTML meta tags for single-page apps, using Open Graph and Twitter web standards. It also produces social media posts and stores the last generated form in localStorage. Inputs cover title, description, keywords, URL, image URL, author and Twitter username.
Command-line tool that saves complete web pages as single self-contained HTML files.
Moon+ Reader is an Android ebook reader with free and Pro versions. It reads local books and supports multiple online book sites, with real-time smooth scroll. Supported formats include txt, html, epub, pdf, mobi, azw/azw3, fb2 and others. It offers visual options, embedded themes, paging options and auto-scroll modes. Reading positions, bookmarks and notes can sync via DropBox or WebDav.
NerdyData is a search engine for website source code and technographic data. It crawls millions of live domains, fully rendering pages including JavaScript, and indexes the resulting source code, cookies, headers and network requests. Users can search for sites using specific technologies, scripts, HTML patterns, cookie names or HTTP headers. The platform supports sales prospecting, market sizing, competitive tracking and security research, and provides API access, a browser extension, Gmail add-on and MCP integration for AI assistants.
New Tab Override is a Firefox add-on that lets users choose which page Firefox shows whenever a new tab is opened. It can open any website, use the current homepage, display a stored local HTML file, or show a plain background color. It also offers options for focus behavior and tab position, and is available in many languages.
Nitrome is a site offering free online games, including Flash, retro, arcade, puzzle, action and skill games, with HTML5 versions of legacy titles among the collections. Its games span browser, mobile, console and PC/Mac. Twin Shot Deluxe, a platform arcade shooter, is announced for Steam, Switch and mobile with 200+ levels and 1-4 player multiplayer.
NotesOnline is a browser-based notepad offering rich text, multiple tabs, autosave and exports to TXT, Markdown or HTML. Notes are stored on the user's device. It also provides keyboard shortcuts, find and replace, and dark mode.
noVNC is an open-source VNC browser client, distributed as a JavaScript library and an application built on it. It runs in modern browsers, including mobile browsers on iOS and Android, and uses HTML5 WebSockets and Canvas. It requires a browser with support for modern features and does not work in Internet Explorer. The license is MPL-2.0.
Nullboard is a minimalist kanban board and task list manager for desktop and keyboard/mouse use. It is a single-page web app with one HTML file, jQuery and a webfont pack, usable offline. Data is stored locally in localStorage and can be exported to or imported from JSON text files. It is described as still very much in beta.
Obtainium is an Android app that installs and updates apps directly from their release pages and notifies users when new releases become available. It supports over a dozen source websites, including GitHub, GitLab, and F-Droid, with configurable filters and settings. A generic HTML source can be customized to find and extract APK info.
A free online tool that scans webpages for dead hyperlinks. It checks internal and external URLs, reports the location of bad links in HTML code, shows 404 errors and other unsuccessful HTTP response codes, and supports sub-domains. The free version limits checks to 3,000 pages and allows one running session per IP address; documents and images are not checked.
An online tool that parses the HTML of a web page and extracts its internal and external links, displaying them in plain text. After a page address is submitted, the system downloads the page and lists the resulting URLs. It is built with the Lynx command-line browser and described for research, development, security assessments and web page testing.
OnlineTextCompare is a free, browser-based two-way text diff and merge tool. It requires no signup or installation, and all comparisons run locally in the user's web browser for privacy and security. The tool highlights differences between two text inputs using red and green arrows, supporting use cases such as reviewing edits and merging content changes. It also offers additional comparison tools for formats including HTML, CSS, JavaScript, JSON, XML, SQL, Excel, PDF, and lists.
MinerU is a tool that transforms complex documents such as PDFs and Office documents into LLM-ready markdown or JSON for agentic workflows. It supports multiple input formats including PDF, images, DOC/DOCX, PPT/PPTX, XLS/XLSX, RTF, ODT/ODS/ODP, EPUB, OFD, HTML/MHTML and CSV/TSV. Version 4.0 offers four parsing tiers and a document library with search and citation locators, and documents are not automatically uploaded to the official service; remote parsing requires explicit configuration.
OpenSpeedTest is a browser-based HTML5 internet speed test that measures download, upload, ping, and jitter without Flash or Java. It works on phones, TVs, consoles, and computers. A free and open-source self-hosted server can be deployed, and a speed test widget can be embedded on websites or apps.
Osintracker is a browser-based OSINT investigation platform. It maps entities and their relationships in an interactive graph and stores all investigation data locally. Users can run matched OSINT resources and import connector results to expand the graph, then export to HTML, Markdown, CSV, JSON or PNG.
oTranscribe is a free HTML5 web app for transcribing recorded interviews, intended for journalists, academics and others working with audio. It works on desktop computers only, offers keyboard controls for pause, rewind and fast-forward, and adds interactive timestamps to the transcript. Work is saved to the browser's storage, and transcripts can be exported to Markdown, plain text and Google Docs.
OverAPI.com is a site that collects all the cheat sheets. It organizes reference sheets for programming languages, frameworks, and developer tools, listing topics from Python and JavaScript to HTML, SQL, and Linux.
Pages is a repository hosting the website of ranger, a file manager. The repository contains the site's HTML, CSS, and JavaScript files, and documents how to build the site, add news, and deploy it.
Paletton is a designer color tool for creating color combinations that work together well. It uses classical color theory with an RYB color wheel to design palettes of one to four hues, each of five shades. Palettes can be previewed in styles including web site design and UI design, and exported in formats such as HTML, CSS, XML, PNG and Photoshop ACO. It is the successor of Color Scheme Designer.
