Let's Encrypt is a free, automated, and open Certificate Authority operated by the nonprofit Internet Security Research Group. It provides free TLS certificates so websites can enable HTTPS encryption; obtaining a certificate requires demonstrating control over the domain, and issuance uses the ACME protocol with client software.
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localhost.run connects web applications running on a computer to the internet using the SSH client already installed on major operating systems, with no download or signup required for free domains. It supports custom domains, automatic TLS certificates for HTTPS, and sharing URLs to show clients work or access a local application from another device.
Luakit is a configurable web browser framework built on the WebKit engine and the GTK+ toolkit, extensible with Lua and licensed under GNU GPLv3. It targets power users and developers who want fine-grained control over browser behaviour and interface.
Machine Learning Mastery is a website that provides educational content such as tutorials, quick start guides, and eBooks to help developers learn and apply machine learning concepts and algorithms. It covers topics like deep learning, computer vision, natural language processing, and specific libraries including TensorFlow, PyTorch, and scikit-learn.
Machine Learning library for the web, Node.js and developers.
Manticore is a developer security tool for smart contracts, testing, monitoring, or audits.
TypeScript-native AI agent framework for web developers. Workflow automation with typed tools and integrations. MIT.
Maxurl is an open source tool that finds larger or original versions of images and videos, typically by replacing URL patterns. It supports over 10,000 hardcoded websites and generic content management systems including WordPress and MediaWiki. The tool is distributed as a userscript for most browsers, a browser extension for Firefox and Chromium-based browsers (via sideloading), a Node.js module, and a web implementation.
mCaptcha is a proof-of-work based captcha system described as privacy focused and fully automated. It states that it does not track or profile users and does not use IP addresses for rate limiting. The project offers an xCaptcha drop-in replacement, and its APIs are described as compatible with reCAPTCHA and hCaptcha. A guide covers installing the captcha on a website.
Media Chrome is a collection of customizable web component media player controls that separate the player UI from the playback engine. It can be used with or without JavaScript frameworks and styled with CSS. The project is now part of Video.js, which offers React components, skins, and smaller bundles.
Merklemap is a subdomain and certificate transparency search engine. It collects Certificate Transparency data by live tailing CT logs and indexing certificates, and offers a web interface, an API, and a CLI for searching subdomains and SSL/TLS certificates.
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.
Meta Tags is a tool for editing and experimenting with page metadata, then previewing how a webpage will appear on Google, Facebook, X and more. The site also links to official debuggers for Facebook, X, LinkedIn and structured data.
Mitosis is an open-source tool that transforms JSX components into functional components for frameworks such as Angular, React, Qwik, Vue, Svelte, Solid, and React Native. Writing UI components once in JSX allows them to be deployed across platforms without rewriting code for each framework. It also integrates with Figma to sync design systems to code and can generate Lit, Stencil, and raw web components.
Mobirise is website builder software for Windows, Mac and Linux that also runs online with AI. Users build sites by arranging blocks and editing text and photos visually, without coding. Mobirise AI generates draft site designs from a description. The software is free for personal and commercial use, and premium themes and extensions are sold as a kit.
MCP Inspector is a developer tool for inspecting Model Context Protocol (MCP) servers, shipped as a single package. It provides four ways to inspect a server: a web app with a Node backend, a scriptable command-line client, an interactive terminal UI, and an experimental connection CLI. The tool manages secrets such as OAuth tokens and stdio env values, storing them in the OS keychain by default.
Mossaik creates abstract SVG backgrounds with waves for websites, mobile devices, tablets, laptops and presentations. Options include the number of waves, angle, color and color mode, and designs can be exported as SVG or PNG images. The editor is launched from the site.
Nekoweb is a free website hosting service created by a group of coders, programmers and artists. It supports custom domains, password-protected pages, SSI, FTP, WebDAV and Git support as donator features, a file editor, and blocking of generative AI crawlers. It is ad-free and run by donations.
Netlify is a platform for building and shipping web projects. It allows users to create with AI tools or code and deploy instantly to production infrastructure. The platform includes features such as agent runners, deploy previews, AI gateway, functions, database, observability, security, and a global edge network, and operates an official Discord community for builders.
A release tracker for software developers and DevOps that sends notifications when software is updated. It supports many providers including GitHub, GitLab, Codeberg, Gitea, Bitbucket, package registries and Docker image tags, and delivers messages through email, webhooks and instant messengers. The service is free and accepts donations.
A download page for Node.js, described as a free, open-source, cross-platform JavaScript runtime environment that lets developers create servers, web apps, command line tools and scripts. The page offers downloads, including prebuilt binaries and signed source tarballs, and links to release information, a changelog, and a blog post.
Feedly Notifier is a browser extension that enables users to read news from the Feedly RSS aggregator. It is available for Google Chrome, Firefox, Opera, and Microsoft Edge, with Safari not supported. The extension is maintained by developer olsh, with its source code hosted on GitHub.
nuxt-seo helps track or improve visibility in AI search, answer engines, and generative results.
OG Image Generator is a free web tool for creating open graph images, social media previews, and Twitter cards. It offers customizable templates, fonts, and optional app screenshot support, exporting images as 1200×630 PNG files.