Portmaster is a free and open-source application firewall from Safing that monitors network connections on a computer. It blocks trackers and malware hosts system-wide and routes DNS queries over DNS-over-TLS by default. Users can set global and per-application rules, including cutting off applications from the internet or restricting connections to certain countries. Downloads are offered for Windows, Debian/Ubuntu and Fedora.
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Sandspiel is a falling sand game that offers a relaxing, creative space to interact with elements including sand, water, plant and fire. It is playable on phones, tablets and computers, and allows users to share their creations with friends.
Santa Clara University is described as a private Jesuit university in Santa Clara, California, in Silicon Valley. The site states that it offers bachelor's, master's, and doctoral degrees through its six colleges.
Sathyabama Institute of Science and Technology is a deemed-to-be university in Chennai, India, marking its 26th year in that status and 39 years since founding. The site lists programs including B.E., B.Tech., B.Pharm., B.Des., B.Arch. and law degrees, and reports campus recruitment offers and examination results.
Sauna is a proactive AI teammate described by its site as an AI agent with a computer of its own. It researches, follows up and builds apps for users and teams, and connects to tools such as Linear, GitHub, Notion, Gmail and Slack. It runs in the cloud and is available on the web, iOS, iMessage, Slack and email.
Savannah is a software forge for free software projects, hosting development, distribution and maintenance of GNU and non-GNU software. It hosts projects that run on free operating systems without proprietary software dependencies, and provides a separate nongnu.org site for non-GNU projects.
Science Forums is a discussion forum with boards covering news, education, physics, chemistry, mathematics, biology, medical science, engineering, earth science, computer help, philosophy, religion and ethics. A homework help section offers assistance with homework problems rather than answers.
Scientific Data Repository is an interactive online data repository that provides real-time visual analytics and interactive data mining and exploration capabilities. It hosts hundreds of datasets across categories including bioinformatics, educational, healthcare, and miscellaneous data, with features such as node and link manipulation, automatic graph layouts, and export of graphs, data, and statistics.
SelfControl is a free, open-source macOS application that blocks access to distracting websites, mail servers, or other internet destinations for a pre-set period. Until the timer expires, blocked sites remain inaccessible even after restarting the computer or deleting the application.
RaiMan's SikuliX is described as an automation tool for what is seen on a computer monitor. The page states that RaiMan stopped development and that the project is now Oculix, directing visitors elsewhere for more information.
Simon Fraser University is a Canadian research and learning community with campuses in Burnaby, Surrey and Vancouver. The site offers program exploration, applications, in-person and virtual campus tours, and library access for undergraduate, graduate and continuing education.
Simple Desktops is a collection of wallpapers designed to make computers beautiful without distraction. The site offers browsing and submission of wallpapers, and names platforms including Mac, iOS, Android and Raspberry Pi.
SimpleCV is an open source framework for building computer vision applications, providing access to libraries such as OpenCV without requiring knowledge of bit depths, file formats, color spaces or buffer management. The platform uses Python, and examples include connecting to a camera, binarizing images and drawing text.
The Singapore University of Technology and Design (SUTD) is a university that advances knowledge and nurtures leaders and innovators through multi-disciplinary education in engineering, architecture and research. It describes itself as the first Design·AI university for the new world.
Siril is an astronomical image processing tool. It supports preprocessing steps such as calibration, stacking and enhancement, and tools for analyzing star brightness variation and astrometry. It can process SER videos and FITS cubes, and algorithms run on all computer cores. Versions are offered for Linux, Windows and macOS.
SmartLinks.org is an alphabetical subject directory offering a collection of links to Internet resources organized into subject categories and topic directories. Its topic directories cover areas including autos, computers, entertainment, government, health, hobbies, news, science, and travel. Links are provided as a courtesy and selected for quality.
SMBGames is a website for playing Super Mario Bros games on a computer, offering roms, hacks and games including Super Mario Bros, Super Mario 2, Super Mario 3 and Super Mario Kart. The roms run through a special emulator that loads in the browser. Other Nintendo characters such as Donkey Kong, Princess Peach, Yoshi and Luigi also appear in the online games.
The Software Heritage archive collects publicly available software in source code form together with its development history. It aims to replicate the collected material to support preservation and to share it with those who need it. The archive grows as new source code is crawled from software projects and development forges. A web interface and API are provided.
South Ural State University (Chelyabinsk, Russia) is strong in Economics, Econometrics and Finance and Business, Management and Accounting.
Southern Illinois University in Carbondale, Illinois, is a university offering undergraduate majors, graduate programs, online programs, off-campus programs, a law school and a school of medicine. Its site describes student life, admissions and research, including work in sustainability, transportation and agriculture.
spacedesk by datronicsoft is software that turns mobile devices, laptops and desktop computers into an extension display monitor or duplicate display for Windows machines. Screens can be cast over WiFi, USB or network cable, and drivers are available for Windows 11/10 and Mac OS.
Spacedrive is a local-first app that connects files, clouds, devices, and sources in one place for browsing and searching. The native version is described as running entirely on the computer, with no cloud, account, subscription, or telemetry. Optional agents can be enabled to work across the data.
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.
SparkChess is a site for playing chess online for free. Users can play against the computer or challenge friends in multiplayer, and the site also offers puzzles and lessons. A premium version removes the 2,000 points limit on scores.