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songsterr.com
Songsterr is a guitar tab site offering over 1 million guitar, bass, and drum tabs with free play-along original audio. It provides an AI tool to create tabs from YouTube links, and users contribute tabs through the website editor. The web app is online-only, while the mobile apps support offline mode.
soosl.net
SooSL is software for making and publishing a sign language dictionary. It works with any sign language and allows videos for signs, example sentences and comments, lookup by handshape, location, motion or gloss, and glosses in written languages. Version 0.9.6 is released for Windows, macOS and Linux.
sadanandpai.github.io
Sorting Algorithms Visualizer provides educational videos, lessons, tutorials, or self-learning resources.
sounter.com
Sounter is a website and mobile app for learning languages through songs, using each song as a course. Lessons cover pronunciation and vocabulary from lyrics. Languages offered include French, Spanish, English, Turkish, Polish and Portuguese. A premium option removes ads and allows offline learning. A version for teachers is also described.
solent.ac.uk
Southampton Solent University is a higher education institution located in central Southampton, within walking distance of Southampton Central train station. It offers undergraduate and postgraduate courses including MA, MSc, MBA and LLM programmes, with start dates in September, January and May. The university delivers gold-rated teaching, industry-standard facilities, practice-led learning linked to industry, personal tutor support, career support, apprenticeships, campus tours and open days. It ranks top for student satisfaction out of 130 institutions in the Complete University Guide 2027, top for teaching quality out of 131 UK institutions in the Times Good University Guide 2025, and top student city in StudentCrowd 2024.
spaceatlas.tech
Space Atlas is a free, interactive 3D map of tracked satellites and rocket bodies orbiting Earth, described as covering objects from Sputnik in 1957 to today. It displays about 22,242 objects in orbit and offers real-time tracking, a timeline scrubber, and a view of satellites passing over the user's location. Orbits are approximated from the public CelesTrak catalog.
spacefinder.lib.cam.ac.uk
Space Finder provides educational videos, lessons, tutorials, or self-learning resources.
space.pointdynamics.com
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.
spaceengine.org
SpaceEngine is a virtual universe simulator for computers. Users can travel from star to star and galaxy to galaxy, landing on planets, moons and asteroids, and can alter the speed of time. Real celestial objects appear alongside procedurally generated regions based on scientific knowledge.
spacefromspace.com
SpaceFromSpace is an archive of satellite imagery that includes declassified Cold War reconnaissance photographs and modern spaceport views. Images are stitched and georeferenced from raw USGS datasets and presented on interactive maps, with galleries covering declassified, spaceport and recently added scenes.
spacesim.co
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.
x.com
Space Telescope Live is an X account that provides up-to-date information on current, past and future observations from the Hubble Space Telescope and the NASA Webb telescope. It asks what the two telescopes are looking at right now and links to spacetelescopelive.org.
spaceweather.com
SpaceWeather.com presents news and information about solar flares, geomagnetic storms, auroras, meteor showers, and near-Earth asteroids. The page displays current solar wind speed and density, X-ray solar flare levels, the daily Sun image, sunspot number, auroral oval, planetary K-index, and interplanetary magnetic field data.
x.com
A social media account for SpaceX, described in its profile as designing, manufacturing and launching rockets and spacecraft. The page lists 11.9K posts and 41.9M followers and links to the company's website.
spanishchecker.com
SpanishChecker is an online editor that finds common spelling and grammar errors in Spanish. Users type or paste text into the editor, which reports possible errors and a grammar score. The site also offers vocabulary and grammar resources and references its French counterpart BonPatron and English counterpart ESLwriter.
spanishdict.com
SpanishDict provides educational videos, lessons, tutorials, or self-learning resources.
sparknotes.com
SparkNotes provides educational videos, lessons, tutorials, or self-learning resources.
heldercorreia.bitbucket.io
SpeedCrunch is a free, open-source high-precision scientific calculator licensed under the GPL. It features a fast, keyboard-driven interface that displays results as users type, with a scrollable input history, customizable syntax highlighting, and an optional on-screen keypad. The calculator supports over 80 built-in mathematical functions, user-defined functions, variables, calculations with up to 50 digits of precision, complex numbers, numeral bases, unit conversions, and includes a library of over 150 scientific constants and common formulas. It is available for Windows, macOS, and Linux in multiple languages.
speedcubedb.com
SpeedCubeDB is a free online speedcubing algorithm and reconstruction database. It covers algorithms for 2x2 through 6x6 cubes as well as Square 1, Pyraminx, Megaminx, and Skewb. The site also lists practice tools including a scramble analyzer and cross trainer, and offers login for tracking progress.
speedsolving.com
SpeedSolving is an online speedcubing community that started in 2006. It hosts a forum, wiki, weekly competitions, a timer and a media gallery. Members can ask questions, enter weekly competitions in WCA puzzle events and track their times and personal bests.
spellcheck.xyz
Spellcheck provides educational videos, lessons, tutorials, or self-learning resources.
spiderid.com
Spider ID is an online community of amateur and professional spider enthusiasts. Registered members submit spider pictures and educational information and help identify spiders. The site displays counts of pictures, species and members, and lists popular spiders and spiders by location.
haraldjoergens.com
Spitfire Panorama is an interactive digital panorama of the cockpit of a 1944 Supermarine Spitfire Mark IX HF9 high-level fighter. It displays and explains all cockpit details of the aircraft. Access to the content requires HTML5/CSS3, WebGL, or Adobe Flash Player Version 9 or higher.