Bleeper is a browser-based tool for creating NES-like sound effects by drawing volume and pitch sequences across eight waveforms. Sounds can be exported to mp3 or wav, and programs saved as text data for later editing. It is described as the official SFX creation tool for Pixelbox.
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Cockpit is a web-based graphical interface for administering Linux servers through a browser. It uses existing system APIs and commands, defaults to normal user logins and privileges, and runs on demand via systemd socket activation. Tasks include managing storage, configuring networks and firewalls, running containers, and managing virtual machines and user accounts.
Online code playground for testing HTML, CSS, and JavaScript snippets in the browser.
Converter is a utility that converts curl commands into code for languages and libraries such as Python, JavaScript and more. Conversion happens entirely in the browser, and the site states it does not transmit or record entered curl commands.
CSS Bed is a collection of classless CSS themes intended as starting points in web development. The site presents themes by name and notes that classless themes are responsive, have good browser support, are small, and require no learning curve for HTML users.
DiffsHub is a browser-based viewer for code changes from public GitHub diff and patch URLs. It renders pull requests, comparisons, commits, diffs and patches in a virtualized interface, and can be opened by replacing github.com in a URL with diffshub.com. Optional fine-grained or classic GitHub tokens, stored in localStorage, allow viewing private diffs. Large comparisons may crash mobile browsers.
Dozzle is a lightweight, open-source log viewer for Docker, Swarm, and Kubernetes. It streams container logs in real time and allows searching, filtering by level or time range, and querying JSON fields with SQL from the browser.
Edbrowse is a text-based combination editor, browser, and mail client with an interface similar to /bin/ed. It was originally written for blind users but is also used by sighted users for its scripting capabilities. A batch or cron job can access web pages, submit forms, and send email without human intervention. Edbrowse can also access databases through ODBC.
explaine.rs is an interactive playground for exploring the syntax of the Rust programming language. Users write Rust code in an editor, and an analyzer explains keywords, punctuation and other code elements when clicked or tapped. The site states it is a work in progress and requires a WebAssembly-compatible browser.
Franchise is an open-source SQL notebook for desktop. It runs a version of the SQLite engine in the browser, so processing happens locally, and users can load CSV, JSON, or XLSX files by dropping them in. A terminal command sets up a database bridge for connecting to PostgreSQL, MySQL, or BigQuery. Published notebooks can be downloaded as HTML documents.
GoatCounter is an open source web analytics platform available as a donation-supported hosted service or a self-hosted app. It reports statistics such as browser information, location, screen size, and referring sites, and identifies visits without cookies or persistently storing personal data. It can be integrated with a single script tag, a JavaScript-free image tracker, backend middleware, or log files.
HexEd.it is a free hex editor that runs in a web browser using HTML5 and JavaScript technology. It is intended for Windows, MacOS, Linux and other modern operating systems, and lets users analyse hexadecimal binary dumps and files and read, manipulate, write, import and export byte as well as bit data.
Hover.css is a collection of CSS3 powered hover effects to be applied to links, buttons, logos, SVG, featured images and so on. Effects are available in CSS, Sass, and LESS, and many use CSS3 transitions, transforms and animations. Old browsers that don't support these features may need extra attention for a fallback hover effect.
jfxr is a browser-based tool by @frozenfractal for creating sound effects, with controls for amplitude, pitch, tone, filters and output. The page notes that exporting WAV files is broken on Safari, and saving opens a new tab that can still be saved manually.
LibreQoS Test helps test internet speed, latency, and connection quality from a browser or command line.
Liveweave is a browser-based workspace for HTML, CSS, and JavaScript with a live preview and an AI coding assistant. It also offers a Python playground, an SVG graphics editor, and a color explorer. The site hosts a showcase of user-created experiments, such as templates and a 3D bowling game.
Melody is a language that compiles to ECMAScript regular expressions, with the goal of being more readable and maintainable. It can be installed via Cargo or from source, and a playground allows trying it in the browser.
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.
OneCompiler is an online code editor and compiler for writing, running and sharing code in the browser. It supports coding agents, embeddable editor and challenge widgets, and APIs for code execution in 110+ languages.
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.
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.
Pinging.net is a web tool for testing and monitoring an internet connection. It reports status for HTTP, DNS, WebRTC and the browser, and shows web ping statistics including last, minimum, maximum and average values and packet loss, with updates every 30 seconds.
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.
RDAP Lookup is a private lookup tool for domain names, IP addresses and Autonomous System Numbers using RDAP, the replacement for Whois. The browser connects directly to the relevant registry's RDAP server over encrypted HTTPS. An optional setting follows the referral to the registrar's RDAP record. The page notes that all generic TLDs support RDAP while only a few ccTLDs have deployed it.