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The Space Physics Data Facility (SPDF) is NASA's active and permanent archive for space physics data, operated by the Heliospheric Physics Laboratory at Goddard Space Flight Center. It provides multi-project, cross-disciplinary access to data from current and past missions, and maintains CDAWeb for data browsing and downloads, SSCWeb for spacecraft orbits, the OMNIWeb database, and the Common Data Format.
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.
SpaceFM is a multi-panel tabbed file and desktop manager for Linux with a built-in VFS, a udev- or HAL-based device manager, a customisable menu system and bash-GTK integration. The project aims to provide a stable, capable file manager with significant customisation capabilities. It requires GTK+ v2 or v3, and udev or eudev or HAL.
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.
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.
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.
spaCy is a free open-source library for Natural Language Processing in Python. It features named entity recognition, part-of-speech tagging, dependency parsing and word vectors, supports over 75 languages and provides 84 trained pipelines for 25 languages.
Movie and television guide from Spaghetti Western Database, covering programmes, credits, discovery, and viewing references.
Spambox is a free disposable temporary email service that provides throwaway addresses expiring after a certain period. It requires no registration and states that mail is automatically deleted after a while. It is presented as a way to keep spam, advertising mail and malware out of a real mailbox.
The IULA-UPF-CC-CLARIN Competence Center provides specialized web services to Humanities and Social Science research communities as part of the CLARIN European infrastructure. It promotes text analysis tools for large textual data, and its catalogue manages, disseminates and provides access to technological tools using a linked open data approach.
SpanishDict provides educational videos, lessons, tutorials, or self-learning resources.
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.
spark is a performance profiler for Minecraft clients, servers, and proxies, with a built-in profiler for diagnosing performance problems and bottlenecks. It also produces heap dumps, summarizes memory usage, monitors GC activity, and reports key metrics. The website serves as an online viewer for spark data.
SparkDEX V4 is a decentralized trading protocol for swapping tokens and accessing on-chain liquidity.
SparkNotes provides educational videos, lessons, tutorials, or self-learning resources.
SPARTA is a collection of open-source audio plug-ins for spatial audio production and playback, distributed in VST, VST3, AU, LV2 and AAX formats for MacOS, Linux and Windows. The plug-ins support ambisonic processing up to tenth order, and the binaural decoders can load custom HRTFs via SOFA files and support head-tracking via OSC messages.
The Spatial Data Repository provides geographically linked health and demographic data from The DHS Program and the U.S. Census Bureau for mapping in a geographic information system. Data products include survey boundaries, indicator data, modeled map surfaces, geospatial covariates, population estimates, and a local data mapping tool.
Spck Editor helps developers write, search, review, test, or manage code and projects.
Speaker Ranking is an independent catalog and ranking project covering speakers, headphones, amps and DACs. Rankings draw primarily on standardized Spinorama measurements for bookshelf and floorstanding speakers, with reviews and listening for products lacking such data. It reports 2492 speakers, 2011 headphones and 213 amps and DACs ranked. The site is funded through affiliate links.
An online repository of temporal specification patterns gathered from common specifications of concurrent and reactive systems. It provides patterns with descriptions mapping system behavior into precise statements in formal specification languages, and it supports mappings to several formalisms with tool support for automated analysis.
Spectra MetaVaults helps users access DeFi yield, vaults, farming strategies, or automated asset management.
Spectrum is Concordia University's open-access research repository. It preserves and centralizes access to research created at Concordia, and scholars deposit their work there to provide free and immediate access, increasing the visibility of their research and the university's intellectual output. It offers quick search, browsing by year, department, author or document type, and advanced search with combinable fields.
SpeechMap.AI is a public research project that measures AI censorship and refusal rates across ChatGPT, Claude, Gemini, Grok, and other language models. It records refusal rates for each model release and publishes a free-speech leaderboard tracking changes over time.
Speed Reader is a free web app for speed reading that supports .txt and .epub files. It offers adjustable words-per-minute, pausing, looping and customizable fonts, colors and font size, including OpenDyslexic. Playback is controlled by spacebar, progress bar and step buttons.
