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.
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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.
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.
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 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.
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.
An Appcues-powered gallery of UX examples covering onboarding tours, in-app feature announcements, user surveys and signup flows, alongside articles and a podcast featuring product and design experts. It is aimed at people seeking inspiration for mobile and web product experiences.
Realtime Colors is a web tool for visualizing color palettes and fonts on a real website. It stores the selected colors, includes a contrast checker, and allows exporting in formats such as .zip, .png, CSS and SCSS. The source also lists a Figma plugin and VS Code.
Renderforest is an AI-powered creative platform for making videos, designs, and websites. It offers AI video, image, and audio generation, over 1200 video templates, an AI video editor, AI website builder, and logo generator. The pricing page lists Lite, Pro, and Business plans, with a free plan available.
Reocities is a free host for hand-made websites, offering a subdomain, a file manager, a visual builder and optional tooling. Sites are static, serving HTML, CSS, JavaScript, images, audio and video as uploaded files. It also provides an HTTP API, an MCP server and optional custom domains and visitor translation.
Replay QA is an autonomous testing harness for web applications. Agents explore an app, write and run tests in a Chromium browser, and record deterministic runtime sessions. It reports bugs such as runtime bugs, UI glitches, accessibility issues, performance problems and security vulnerabilities, with a root cause and suggested fix. Reports go to GitHub, Linear, Jira or other HTTP endpoints.
A page of responsive static website themes coded by the author and split into static and responsive categories. Visitors may use the themes for their own sites, with the request that credit be left somewhere on the page.
Resend is an email platform for developers. It provides an interface for sending transactional and marketing emails, with SDKs for programming languages. Features include modular webhooks for delivery, open, bounce and click notifications, a test mode, contact management, broadcast analytics, and email development using React.
ResponsiveTestTool is a free web tool for previewing any website across mobile, tablet, desktop and TV screen sizes. Users paste a URL to see how the site renders on different devices without signing up.
Responsivize is an open-source, cross-platform desktop app for developing responsive websites. It lets users test web apps on popular devices or custom dimensions and includes device frames, browser menubars and search bars. The app works on Windows, MacOS and Linux and is free to use.
A simple web page for testing APIs. Users specify an HTTP method, URL and parameters and click to send an Ajax request. The page requires a browser with HTML5 support.
Retype is a Markdown-first documentation website builder that turns Markdown files into a website. It installs via npm, Yarn, or the dotnet CLI, and running retype start builds the site and opens it in the browser. Retype Pro and Enterprise licenses unlock Pro features; the Free plan lists three projects. Sites can be hosted on any web server or on GitHub Pages, Netlify, or Cloudflare.
RustPython is an open source Python 3 interpreter written in Rust. It can be embedded into Rust programs as a scripting language or compiled to WebAssembly to run Python in the browser. It is released under the MIT license.
Sandstorm is an open source platform for self-hosting web apps. Each document, chat room or other item is containerized in its own sandbox, and items stay private until shared through a unified access control interface. Apps are installed from an App Market and receive automatic updates. Users can run it on their own machines or on hosting services.
SemanticDiff for GitHub is a web tool that lets users review GitHub commits and pull requests using a language aware diff. Users log in via GitHub. The site links example pull requests from axios, DevToys and Apache Drill.
ServerSearcher is an independent comparison site for cloud, VPS, dedicated, and GPU servers. It aggregates plans, pricing, and locations from multiple hosting providers so users can compare options in one place. ServerSearcher does not sell hosting; choosing a plan redirects to the provider's website to complete the purchase.
Silex is a free, open-source visual builder for static websites aimed at professional web designers and no-code developers. It is maintained by Silex Labs, a French non-profit, and is a project of the OW2 open-source community. The tool can connect to a CMS or API, including WordPress, Strapi, Squidex and Supabase, and hosting is included. Silex can be used on v3.silex.me with nothing to install, or self-hosted.
Slint is a declarative GUI toolkit for Rust, C++, JavaScript and Python, building native user interfaces for embedded, desktop and web from a single codebase. It supports integration into embedded Linux distributions such as Yocto, Torizon and Wayland, and can run on devices with or without a GPU. Pricing includes GPLv3 open-source, royalty-free and paid commercial options.