resttesttest.com
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.
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retype.com
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.github.io
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.org
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.
searchcode.com
searchcode.com is an MCP server providing structured code intelligence for LLMs, with six specialized tools to analyze, search and retrieve code from public git repositories. It is free during beta with no signup or API key.
app.semanticdiff.com
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.com
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.me
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.dev
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.
sourcegraph.com
Code search platform for searching repositories, symbols, and code across large projects.
srht.site
sourcehut pages is a tool for publishing static websites. Every sourcehut user receives a username.srht.site domain, and custom domains are supported. It works with any content generator, including Jekyll, Hugo, and Doxygen, and provides automatic, zero-config TLS.
speedvitals.com
SpeedVitals is a website speed testing tool that runs page speed tests from 30 or more locations and devices and measures Core Web Vitals. It also provides a TTFB test, batch analysis of up to 50 tests, performance monitoring with email and Slack alerts, and reports including waterfall charts and resource summaries. The site lists free tools such as an image compressor and an SEO analyzer.
spritefusion.com
Sprite Fusion is an independent software company making tools for game development. Its tilemap editor is a free, web-based level design tool for crafting 2D tilemaps in the browser using any tileset, with auto-tiling, collisions and one-click exports to game engines. The company also offers a pixel art generator, a Pixel Snapper tool and an API.
github.com
GitHub list of Google custom search engines for OSINT, sourcing, and public web research.
sqlook.com
SQLook is a web-based SQLite database manager that runs in the browser on the client side, with no installation or server required. It opens and creates SQLite databases, shows database structure and statistics, and includes an SQL query editor with syntax highlighting and query history. It also offers a visual query builder and a database generator with sample data population.
sshx.io
sshx is a web-based collaborative terminal that lets users share a terminal with others by link on a multiplayer infinite canvas. It offers real-time collaboration with remote cursors and chat, end-to-end encryption, and a lightweight server written in Rust. It is available as a command-line tool for macOS, Linux and Windows.
stalw.art
Stalwart is an open-source mail and collaboration server written in Rust. It supports JMAP, IMAP4, POP3, SMTP, CalDAV, CardDAV and WebDAV, combining email, calendars, contacts and file storage in one server with built-in spam and phishing protection. It runs as a single node or as a cluster.
star-history.com
Star History is a web tool for viewing and comparing the GitHub star history graph of open source projects. The site also lists a top committers ranking and provides a Chrome extension.
surge.sh
Surge is a static web publishing service for front-end developers that deploys projects from the command line to a CDN. It offers free custom domain support, free SSL for surge.sh subdomains, pushState support for single page apps, custom 404.html pages, and a CLI. Projects can be deployed through build tools such as Grunt, Gulp, Git Hooks, and npm run scripts.
tailblocks.cc
TailBlocks is a storage, design, or frontend resource for mockups, assets, UI tools, or web search.
tailspark.co
Tailspark is a storage, design, or frontend resource for mockups, assets, UI tools, or web search.
tailwindcss.com
Tailwind CSS is a utility-first CSS framework for rapidly building modern websites without leaving HTML. It provides classes such as flex, pt-4, text-center and rotate-90 that can be composed to build designs directly in markup. A Vite plugin integrates it with frameworks including Laravel, SvelteKit, React Router, Nuxt and SolidJS.
tailwindtoolbox.com
Tailwind Toolbox is a frontend design resource for CSS frameworks, UI components, and web interfaces.
tech-blogs.dev
An index of independent tech blogs covering JavaScript, CSS, DevOps, Python and related topics, written by people who build things. The page also lists free developer tools and reading maintained by Marko Denic, including web development resources, an article banner tool, a snippet editor, code tools and a JavaScript quiz.