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Onelang is a browser-based IDE for cross-language editing, exposed through a web interface. The page notes that unsupported browsers may not work and recommends the latest Chrome or Firefox. It offers demos covering generic features, reflection, inheritance, big integers, JSON handling and Hello world, and states that the compiler backend requires authentication.
OneLinePlayer is a free web video player for Vimeo and Dropbox videos. It uses a direct link to a video file and offers preview images, player style adjustments, and controls such as autoplay, loop and mute. A GIF mode is available. The makers state they are not a video hosting platform. Certain Vimeo controls customization requires a Vimeo Plus plan or above.
OONI, the Open Observatory of Network Interference, is a global community measuring internet censorship. OONI Probe tests the blocking of websites and apps and measures network speed and performance, while OONI Explorer displays censorship data collected from over 200 countries since 2012.
OpenPanel is a multi-user web hosting control panel built around lightweight containers. Each user gets an isolated environment with a separate MySQL server, PHP version, Redis instance and root access. Administrators and resellers manage servers through the OpenAdmin panel, and the OpenPanel interface lets clients manage domains, websites, services and email. OpenCLI provides terminal commands for panel actions.
OpenZeppelin is a developer security tool for smart contracts, testing, monitoring, or audits.
OpenZeppelin Defender is a developer security tool for smart contracts, testing, monitoring, or audits.
OTTRun provides white-label OTT apps for Android, Apple TV, iOS and web, along with middleware for IPTV, OTT and hotel providers. It offers the OTR Panel for managing content and customers. Apps are branded as the operator's own and published under the operator's developer account. The official players contain no media content.
Own-Free-Website.com is a service for creating a free homepage without coding skills. It offers a short ".page.tl" domain ending, up to 1 gigabyte of free web space, design templates, and features such as a guestbook, hit counter and survey function. Premium packages are available for extending a site.
Pa11y is a set of free and open source tools for automated accessibility testing of web pages. The command-line interface loads pages and highlights accessibility issues, while Pa11y Dashboard tests pages daily and graphs improvements and regressions. Pa11y Webservice is the JSON-based webservice behind the dashboard, and Pa11y CI iterates over a list of pages for use in CI.
PaletteGenerator is a tool for generating color palettes for web UX/UI design. It offers 8 harmony methods, a live interface preview, palette refinement, and export to CSS variables, JSON and SVG.
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.
Papra is an open-source document archiving platform for organizing, securing and archiving documents. It offers organizations, document tagging, search, a developer API, webhooks, CLI and SDK, plus email ingestion that imports attachments. The project is available on GitHub under the AGPL-3.0 license and can be self-hosted. Paid plans add storage, members and intake email addresses.
Lorem Picsum provides placeholder photos. Adding an image size to the URL returns a random image, and options allow a specific image, a seeded random image that stays the same, grayscale and blur. Multiple options can be combined, and .jpg or .webp file endings can be added. Endpoints list images and return details about a specific image.
Pipcook is a JavaScript application framework for machine learning and its engineering, aimed at Web developers. It provides subprojects including a machine learning pipeline framework, management tools and a JavaScript runtime for machine learning. A Pipcook Pipeline composes scripts and outputs an NPM package containing the trained model and JavaScript functions. The documentation describes a workflow of install, train, test and deploy using the Pipcook command-line tool.
Plays.org offers thousands of free browser-based online games across hundreds of categories, playable directly in a web browser with no app downloads required. Games are licensed from hundreds of developers, and the site lists featured, new, desktop, mobile and player-favorite games.
A web automation and testing framework for apps, scripts, and AI agents. It offers a test runner with auto-waiting and assertions, browser automation across Chromium, Firefox, and WebKit, and a Model Context Protocol server for AI agents.
pnpm is a package manager distributed as a native executable for version 12, with prebuilt binaries for multiple operating system and architecture targets. It can be installed through a standalone script on Windows and POSIX systems or through npm, which requires Node.js 22.13 or newer. Updating to pnpm 12 is possible via self-update if pnpm 11.10.0 or newer is already installed.
ProFreeHost is a free web hosting service for personal and commercial use. It offers PHP, MySQL, FTP and email hosting with unlimited bandwidth, a control panel, a one-click installer and free subdomains. The features page lists 5GB diskspace with quotas for addon domains, parked domains and MySQL databases.
Project CSV is a free, open-source web application for viewing and editing .csv files in a browser or offline. It processes file data locally on the user's device without sending it over the network or collecting other data. The application allows selecting .csv files, adjusting settings, generating editable tables, and downloading the edited table.
Project Wallace is a web-based CSS analyzer that examines stylesheets for complexity, specificity, performance and design tokens. Users paste a URL or raw CSS to receive a full analysis, a quality score, a design token audit and a custom property inspector, plus a cascade layer visualizer. Standalone tools include a CSS prettifier, minifier, diff viewer and specificity calculator.
PronounDB is a browser extension that lets people share their pronouns and see the pronouns of others on supported sites. It offers integrations for platforms including Discord, GitHub, Twitch and Twitter, and provides an API for third-party developers. Extensions are available for Chrome, Firefox and Edge.
Publii is a free, open-source desktop CMS for static websites. Content is written locally and published to hosts such as GitHub Pages, Netlify, Amazon S3 or via FTP, with no database, PHP or public admin panel. It offers Markdown, WYSIWYG and block editors for blogs, portfolios and documentation sites.
PythonAnywhere is a cloud service for hosting, running and coding Python. The basic plan provides access to machines with a full Python environment already installed, and quickstart installers are available for Django, web2py, Flask and Bottle.
Radiata is a stable diffusion web UI built on the diffusers library that uses TensorRT high-speed inference technology. Its official documentation provides resources for introduction, installation, usage, developer guidance, and troubleshooting for Windows and Linux operating systems. It is categorized under AI & Machine Learning with a focus on AI image generation.
