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LinuxServer.io is a community group that builds and maintains Docker images. Its images share a common base using s6-overlay, and rebuild automatically when upstream applications or dependencies are updated. Setup guides are provided on GitHub and a documentation site, with support through Discord and a Discourse forum.
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.
massCode is a free and open-source developer workspace for code snippets, Markdown notes, HTTP requests, calculations, and quick developer utilities. It is a local-first desktop app organized into Spaces, with a built-in AI assistant that connects to a user's own AI provider or a local model.
Meshtastic is an open source, community-driven project that uses LoRa radios as an off-grid communication platform in areas without reliable communications infrastructure. Devices rebroadcast messages to form a mesh network without cell towers, WiFi or internet, and can be paired with a phone or computer via Bluetooth, WiFi or USB. Clients include Apple and Android apps, a web client and a Python CLI/SDK.
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.
Million describes itself as a research lab specializing in frontend coding data that builds open-source developer tools, datasets, and reinforcement learning environments for people and frontier coding agents. It builds environments and evals in which agents ship features, deploy applications, and debug issues, including React Bench.
Modern CSS Solutions is a series by frontend developer Stephanie Eckles examining modern CSS approaches to common frontend problems. Articles cover topics such as custom properties, container query units, CSS math functions, selectors, accessibility upgrades, and testing browser feature support with fallbacks and build tools. A companion site, SmolCSS, offers minimal snippets for modern layouts and components.
ngrok is developer infrastructure that routes and secures traffic to apps, APIs and AI models wherever they run, from localhost to production. It offers an AI Gateway, a gateway to services running anywhere, and localhost sharing. It provides a REST-style API at https://api.ngrok.com, plus client libraries, a CLI and a Terraform provider. A guide covers exposing a local MCP server with a stable public HTTPS URL secured by Traffic Policy.
A service that provides shareable links to download build artifacts from GitHub Actions builds. Public repositories are accessible by default without login, and links can point to the latest artifact or a particular run. A GitHub App can be installed so downloads for a repository do not share the global API rate limit.
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.
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.
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.
Oracle Cloud Free Tier lets users build, test and deploy applications on Oracle Cloud. It includes Always Free cloud services usable for an unlimited time and a US$300 cloud credit to use within 30 days on all OCI services. After 30 days, accounts continue to receive Always Free services.
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.
PocketBase is an open-source backend tool distributed as a single file. It includes a realtime database, user authentication, file storage, and an admin dashboard. It can be used as a standalone application or extended via Go and JavaScript hooks, and integrates with common frontend development stacks.
A free course for people with some coding experience who want to learn how to apply deep learning and machine learning to practical problems. It includes 9 lessons of around 90 minutes each, covering computer vision, natural language processing, tabular analysis, and collaborative filtering, plus building and training models, random forests, deployment, and use of PyTorch, fastai and Hugging Face.
React Suite is a suite of React components for building enterprise applications. It features 80+ components, responsive design, dark mode, internationalization, accessibility support, and TypeScript-ready code, and is free and open source. It can be installed with npm and used across frameworks including Next.js, Vite and Create React App.
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.
A web hosting provider offering free web hosting along with shared, semi-dedicated and VPS hosting, domain registration, SSL certificates and site-building tools such as the Zacky Website Builder and app installer. Support is offered around the clock, with automatic data backups and a multi-domain shared hosting setup.
Remotion is a tool for creating videos and motion graphics with React. It supports using coding agents, bulk rendering, server-side and client-side rendering, and building applications such as a player or editor starter. A free license covers individuals and companies of up to 3 people. System requirements include Node 16 or Bun 1.0.3, with macOS 15 or later required.
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.
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.
Scuttlebutt is a decentralised social network described in its documentation as a secure gossip platform. The site collects video talks and presentations covering the protocol, network, applications, community and culture, including topics such as offline workability, cryptographic authenticity and data ownership.
