SocialCompare is a free collaborative comparison engine for creating comparison tables with the user's own criteria. Comparison tables can be embedded on a blog or website, and the community can update tables, vote, share and write user reviews across areas such as software, mobile apps, products, services, websites and startups.
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Search engine for Reddit posts and comments with filters for keywords, users, and subreddits.
Sodium supports game modding, engines, custom content, or fan-game development workflows.
Sonolus is described as a next generation rhythm game. It lets users explore rhythm games, connect with other players, and create and share their own levels and replays. A scripting system allows creation of rhythm game engines.
Soovle is a free keyword tool that lets users find keyword variations and search suggestions across multiple search engines including Google, Amazon, YouTube, Bing, Yahoo!, Pinterest, Answers.com, and Wikipedia. Users can select up to six sources at a time, star preferred results, export their starred keyword lists, and use the exported keywords to develop content topics, page titles and headings. Soovle does not display keyword data such as search volume, keyword difficulty or cost per click.
Source Filmmaker is a movie-making tool built and used by Valve to make movies inside the Source game engine. It uses the same assets as the game, so anything in the game can be used in the movie. It is available for free as a public beta and requires a Windows PC. It includes Team Fortress 2 base game assets and assets from early Meet the Team short films.
Apache Spark is a multi-language engine for executing data engineering, data science, and machine learning on single-node machines or clusters. It provides high-level APIs in Java, Scala, Python and R, and supports Spark SQL, pandas API on Spark, MLlib, GraphX and Structured Streaming. The documentation covers downloads, the shell and client applications.
Platform for information, networking, research and data exchange for the fields of construction engineering, architecture and urbanistics.
Specialized AI vision for extracting engineering specs from PDF/JPG to Excel.
Spiral is Imperial College London's institutional research repository built on DSpace-CRIS, a free open-source Research Information Management System. It enables secure, integrated, and interoperable management of research information and data, and supports key international standards for interoperability and data transfer. Users can deposit doctoral theses, master's dissertations, and publications via the platform. Imperial College London also operates the separate Helix repository for future research dataset deposits.
Splash Protocol is a decentralized trading protocol on Cardano. It offers a Temporal Liquidity Book that builds markets from multiple AMM liquidity pools and an order book, and composable orders executed by an execution engine. The protocol describes decentralized, permissionless automation and open-source smart contracts, plus SPLASH DAO governance through locked SPLASH tokens.
Springboard is an education technology company that offers online career tracks in data science, machine learning, artificial intelligence, cybersecurity, software engineering, and UX design. Its blog provides articles on certifications, skill building, and career planning. The platform also partners with employers to hire emerging talent and offers team upskilling solutions.
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.
Sprout is an interactive anime recommendation engine that uses a machine learning model to generate tailored recommendations based on watch history and ratings from MyAnimeList or AniList profiles. It also provides stats and visualizations of personal watch history and preferences, plus the Atlas Visualization. Sprout is fully open source.
The University of St Andrews Research Portal provides access to the university's research, including articles, books, datasets and theses produced by its researchers. Full text is available online free of charge where available. The portal also presents research organized by UN Sustainable Development Goals and by collaborations and top research areas from the last five years.
Search engine for Stack Overflow answers, questions, code snippets, and developer discussions.
Stevens Institute of Technology is a private research university based in Hoboken, New Jersey, with a campus situated across the river from New York City. It provides undergraduate, graduate and corporate professional education programs with a focus on STEM and technology fields, and its curriculum incorporates hands-on research and co-op experiences for students prior to graduation. The university also hosts campus tours, information sessions and various events for prospective students.
StrokeIt is a mouse gesture recognition engine and command processor for Windows. Users draw symbols on screen with the mouse and the program performs the action associated with a recognized gesture. It comes pretrained to recognize more than 80 unique mouse gestures. It is free for individual and not-for-profit charitable entity use.
Subtitld is a free, open-source subtitle editor for Linux, Windows, macOS and Haiku. Users can time subtitles on the waveform, transcribe and translate with engines running on their own machine, and dub with synthetic voices. It opens video, subtitle or transcript files and saves to SRT, VTT, TTML and other formats.
SuperCollider is a platform for audio synthesis and algorithmic composition, used by musicians, artists and researchers working with sound. It is free and open source software for Windows, MacOS and Linux. Its three main components are scsynth, a real-time audio engine implemented as a server; sclang, an interpreted programming language acting as a client; and scide, an editor for sclang.
Supermemory is a memory and continual learning engine for AI agents. It extracts and stores context from users and tasks in a vector-graph database, then injects prior memories into an agent's context. It is offered through an API, plugins, and MCP, and supports ingestion of text, URLs, documents, PDFs, Office and Google Workspace files, code, markdown, images, audio, and video.
AI literature search, document translation, and deep-research workspace for researchers.
Surge XT is an open source hybrid synthesizer originally released in 2005 and previously sold commercially as Surge by Vember Audio. It combines subtractive synthesis with oscillators, filters, a modulation engine and effects, and supports MPE, microtuning and OSC.
SVGFast converts PNG and JPG images into SVG vectors. It offers unlimited conversions without sign-up and free API access during the beta after signing in with Google or GitHub. The API returns optimized SVG from the same engine, with keys sent in an authentication header.