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.
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Speechma is an online text-to-speech converter that turns text into audio using a library of AI voices. The site states that no registration is required and that generated audio can be used commercially. A REST API for developers is also offered under a monthly subscription.
Speechnotes is an online speech-to-text service that converts speech to text in real time and transcribes uploaded audio and video recordings. It also offers a Chrome extension for voice typing, a transcription API, Zapier integration, and Android and iOS apps.
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.
SpyFu is a competitor keyword research tool for Google Ads PPC and SEO. It allows users to view competitors' PPC and SEO keywords, ad tests, backlink profiles, and includes AI-powered site audits, daily performance tracking and an API.
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.
Ssemble is an AI clipping tool that turns YouTube videos and uploaded files into short-form clips, adding captions, music and overlays. It supports YouTube, Vimeo, Kick, Twitch and file uploads, and can schedule and auto-post to TikTok, YouTube Shorts and Instagram Reels. A REST API allows programmatic creation of clips for automation and integrations.
SSL For Free issues free SSL and wildcard certificates through ZeroSSL, including via ACME, a web app and a REST API. It offers paid Basic, Premium and Business packages with monthly or yearly billing, plus tutorials for installing certificates on various server and hosting platforms. Private keys are generated and encrypted on the user's device.
Stemformatics is a platform for exploring gene expression datasets and samples. It hosts integrated data atlases covering myeloid, blood and dendritic cell populations, and enables users to discover genes and pathways. The platform provides access to hundreds of gene expression datasets, offers API access for developers, and shares information about its team, data processing practices, privacy policies, licensing and funding sources.
StoreDev is a GitHub organization that hosts the Storelib library for accessing Windows Store APIs, as well as descendant projects that rely on the library. The organization notes a planned rewrite of Storelib is upcoming.
Strapi is an open-source JavaScript/TypeScript headless CMS. It lets developers design content types in a no-code builder, which turns the content model into REST and GraphQL APIs. It can be hosted on the user's own servers or deployed to Strapi Cloud.
The Strasbourg astronomical Data Center (CDS) is a data center dedicated to collecting and distributing astronomical data and related information worldwide. Located at the Strasbourg Astronomical Observatory in France, it provides access to services including SIMBAD, a database of astronomical object identifications and bibliography, and VizieR, a library of astronomical catalogues. It also offers libraries, tools and APIs for accessing its data.
StrawPoll is a web tool for creating instant, real-time polls and surveys. Polls can be created without signup, and results are shown live in pie chart or bar graph form. Bots and VPN users are blocked from voting by default, and polls run indefinitely unless a deadline is set. An API supports poll creation and result analysis, and integrations include webhooks and data export.
StreamLink is a command-line utility that extracts video streams from various services and pipes them into a video player such as VLC or mpv. It uses a plugin system to support services including Twitch and YouTube, and a Python API is available for developers. The project was forked from Livestreamer, which is no longer maintained.
Streamtape is a video sharing website that lets users upload videos, copy links and share them. It offers unlimited storage, unlimited bandwidth, accepts files up to 15 GB, and provides an API, statistics and optional downloads. Adult content is allowed and monetizable, and users can decide how many ads viewers see.
StrexoPlayer is a media player that connects to tracking and skip data services, including Trakt, Simkl, AniList, the Stremio API, IntroDB, TheIntroDB and AniSkip. It offers iOS and Android TV betas, with an Apple TV closed beta; Android mobile is in development. It states it is independent and not endorsed by those services.
SubDomainRadar is a service that is paused. It is no longer accepting scans, API requests, or new signups while the platform changes hands. Existing account data is retained, and recurring billing for active subscriptions has been stopped. The same team offers LeakRadar, a data breach monitoring service.
Supabase is a Postgres development platform for building applications with a Postgres database, Authentication, instant APIs, Realtime, Functions, Storage and Vector embeddings. Every project includes a full Postgres database, and the platform auto-generates a REST API from the database schema using PostgREST. Documentation covers connecting frameworks, building backends, extending databases and migrating existing data.
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.
Taskwarrior is free and open source software that manages a TODO list from the command line. It is described as flexible, fast and unobtrusive. The project offers documentation, man pages and a hook script API, and imports and exports JSON.
Telescope is a publishing platform focused on simplicity, speed, and privacy. It offers an editor for images, videos, tweets, and code blocks, and provides free SSL and CDN, unlimited posts and pageviews, and a REST API. A paid Plus/Pro tier adds custom domains, style changes, branding removal, unlimited blogs, and extended statistics.
Temporary URL creates temporary links and QR codes that expire at a chosen time. A Premium subscription at $1 per month adds features such as ad-free redirection, API access and mass creation of up to 30 temporary URLs. Links can also be set to activate on a future date.
GFPGAN is a face restoration algorithm for old photos or AI-generated faces, created by tencentarc and available on Replicate. The model runs on Nvidia L40S GPU hardware and costs approximately $0.0076 to run. It is also open source and can be run on a personal computer with Docker.