Space Time is a browser-based 3D universe explorer built from astronomical catalogs, telescope surveys and computed motion. It covers the solar system, stars, deep-sky objects and the observed cosmic web in one continuous view, with no account required. It is free and requires no download.
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Space Type Generator helps clean, compare, sort, transform, count, or format text in the browser.
SpaceSim is a free 3D space simulator that runs in a browser. It offers travel across the Solar System, time changes, source-backed worlds and postcards, along with journeys such as a grand tour of the Solar System, an ISS trajectory view and a procedural stellar laboratory for known stellar objects.
A browser-based emulation of a DEC PDP-1 running the original Spacewar! code, presented as an HTML5/JavaScript emulator. It includes an informative splash screen not in the original game and multiple versions of the original code. The game was conceived in 1961 and first realized on the PDP-1 in 1962. The emulation is by Norbert Landsteiner.
Sparked Paste helps clean, compare, sort, transform, count, or format text in the browser.
SpectrShare is a browser-based file sharing tool. Users drop files, start sharing, and send a unique link so files download directly between browsers. The site states there are no signups, uploads or cloud storage, and that closing the tab ends the share. It also lists built-in video streaming and file preview.
Speechify is a text to speech and voice typing assistant that reads books, PDFs, documents and web pages aloud with natural-sounding voices. It offers text highlighting, speed control and scan and listen, and is available as browser extensions, desktop apps for Windows and Mac, and mobile apps for iOS and Android.
SpeedyApply is a job application autofill tool offered as a free browser extension for Chrome, Edge and Firefox. It automatically fills out and tracks job applications, and a Premium option is available with a 3-day free trial.
Spicetify is a command-line tool for customizing the Spotify client. It supports themes that change colors, fonts, and visual styling, extensions that add new features, and custom apps that add entirely new pages to Spotify's sidebar. Customizations can be installed through the built-in Marketplace browser or manually and applied with CLI commands.
Browse live games, matches, races, or fight cards through Split TV's sports schedule.
splix.io is a browser-based io game in which players compete to conquer as much land as possible. It offers spectator mode, global leaderboards and server selection. The server code was rewritten, and the game is now open source, allowing users to host their own server instance.
Sports Games is a rentry page listing browser-based sports games and simulations. Entries cover basketball, football, baseball, hockey, soccer and golf, including roster building, daily puzzles and season simulations. Named titles include 82-0, Eraball, Six Rings, Immaculate Grid, 20-0, Poeltl and NBA Guess.
Browse live games, matches, races, or fight cards through SportyHunter's sports schedule.
Spotify Dedup is a free browser-based tool that finds and removes duplicate songs from Spotify playlists and liked songs. Users log in, and the app uses the Spotify Web API to check the library and remove duplicates, leaving other songs untouched, with verification before deletion. It is open source, and the site states that 20M+ duplicates have been removed since 2014.
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.
SpriteSheep is a browser-based pixel art and sprite animation editor. It provides layers, frames, palettes and dithering tools, plus a tileset workflow, for building sprites and frame-by-frame animations without installation. The site labels it an alpha build in active development and free to use.
Spritesheet Generator is a free browser-based tool for building sprite sheets for game development. Users upload sprite images or a JSON atlas, arrange frames in a grid, preview animations at adjustable frame rates, and export as PNG, JSON, ZIP or GIF. It includes a pixel editor, recolor controls and an atlas packer. The site states images stay on the user's machine and the tool works offline.
Sprocket School presents a browser-based catalogue of films, series, and episode pages.
SQL Easy is a free interactive SQL tutorial offering 31 exercises that run against a real SQLite database in the browser. It provides hints when users are stuck and immediate feedback when a query is correct, and requires no signup. It is built by the team behind Beekeeper Studio.
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.
A free online tool for creating blocky, 8-bit-style avatars and square face icons. Users customize face shape, eyes, mouth, colors, hairstyles and accessories in the browser, then export high-resolution PNG files. The tool runs locally on the device, and a login is not required.
A free daily pool puzzle game with a new level every day. Players sink all solid balls in as few shots as possible, combine balls of similar colors, and can share scores and challenge friends. It runs in a browser on desktop or mobile without installation, and past levels remain playable in an archive.
Squoosh is a browser-based image optimizer for compressing and comparing images with different codecs. Images are processed locally and never leave the device. Users open an image, inspect differences, and save, with settings adjustable for smaller files.
srrDB is a public collection of Warez scene information, holding ReScene and nfo files. It is described as a historical record of the warez scene, and its help page states that no downloads are offered there. Users can browse entries, and the site provides an API, wiki, IRC channel and open data dumps.