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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.

Spiral

spiral.imperial.ac.uk

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.

SpyFu

spyfu.com

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.

SSL for Free

sslforfree.com

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.

Stable Diffusion Akashic Records Maks-s/sd-akashic

github.com

Stable Diffusion Akashic Records is a GitHub repository collecting studies, art styles, prompts and other resources for exploring Stable Diffusion. It includes lists of art styles and artists, a keyword list, prompts and guides, and notes that prompts must be 75 tokens or less and are case insensitive.

Stainforth Library of Women’s Writing

stainforth.scu.edu

A scholarly digital edition of Francis Stainforth's library catalog, listing 7,122 editions by over 2,800 writers, nearly all women. It makes the catalog manuscript searchable and offers page images, with browsing and search by title, name, keyword, format and publication year.

StartIsBack

startisback.com

StartIsBack is a shell enhancement that returns a start menu and start button to Windows 8 and Windows 10, behaving as in Windows 7. It also offers taskbar skinning, jump list replacement, centered taskbar icons and Start menu customization. Versions exist for Windows 8, 8.1 and 10, with StartAllBack for Windows 11. A trial is available and a license key costs $4.99.

Startpage Emporium is a curated showcase of browser startpages created by 0XE4, listing over 70 beautiful startpages from across the web as of the snapshot, with a total of 80 startpages listed. The showcase includes startpages with a range of features including minimal design, search functionality, keyboard controls, to-do lists, weather updates, speed dials and themed designs, and accepts user submissions of startpages for inclusion.

Streama

github.com

Streama is a self hosted streaming media server. It organizes video files into a personal library with a dashboard showing recently watched shows and movies and their progress. The player has a next episode button and an episode and season browser. Setup requires an upload directory and a theMovieDb.org API key in the settings page.

StreamLabsTikTokStreamKeyGenerator

github.com

TikTok Live Stream Key Generator for OBS Studio using Streamlabs API

A site presenting statistics for every subreddit, including subreddit ranking lists and per-subreddit stats such as graphs. It also links to network visualisations of subreddit relationships and keyword frequency tracking. The operator cautions that the data collector is not robust and the numbers should only be used as a general guide.

Summrize

summrize.com

Summrize offers free interactive summaries of nonfiction books, with content such as quotes, frameworks and key ideas. The site states that summaries can be read in under 15 minutes and that more books are being added daily.

Surfingkeys

github.com

Surfingkeys is a browser extension for Chrome, Chromium-based browsers, Firefox and Safari that provides keyboard-based navigation and control of the web in the spirit of the VIM editor. It is intended for users who need more shortcuts for their own functions, and its settings are described in JavaScript, allowing keystrokes to be mapped to user-defined JavaScript functions.

SVG Studio is a free, browser-based SVG animation editor with no sign-up and no telemetry. It provides a keyframe timeline, animatable position, rotation, scale and opacity properties, SVG import, easing functions, loop control and export of self-contained animated SVGs with embedded CSS keyframes.

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.

SwarmVault

github.com

SwarmVault is a local-first tool that turns documents, code, transcripts, notes and URLs into a markdown wiki and a local knowledge graph for AI agents. It follows a three-layer architecture based on a pattern described by Andrej Karpathy. A first run requires no API keys, using a built-in heuristic provider that runs locally and offline.

Swedish Board for Study Support Open Data

csn.se

Find published open datasets through filters, categories and keyword search.

Switch Army Knife

gamebrew.org

Switch Army Knife is a Windows tool for handling XCI and NSP content from a Switch console, including patching, splitting, merging, converting and compressing files. It requires dumped keys and is no longer maintained.

Symbols

symbols.com

Symbols.com is an online encyclopedia of symbols, signs, ideograms, glyphs and flags, organized by culture, country and religion. The collaborative project is built by contributing editors and can be browsed by category, alphabetically or by keyword search. Its collection ranges from ancient alchemical signs to modern currency signs and awareness ribbons.

Tablacus Explorer is a tabbed file manager with add-on support, offered as a portable download that requires no installation. It runs on 32-bit and 64-bit Windows versions from Vista to 11, with multiple language and Unicode support. Columns include total file size and label, and associations, menus, keys and mouse gestures are customizable. The source is open and released under the MIT License.

Taichung city Open Data

opendata.taichung.gov.tw

Find published open datasets through filters, categories and keyword search.

Talkwalker

talkwalker.com

Talkwalker Alerts is a free web monitoring service that functions as an alternative to Google Alerts. It tracks mentions of brands, competitors, events or user-specified topics across the web, and sends real-time alerts to users’ email inboxes, RSS feeds or Slack accounts. Users can customize alert settings including source type (news, Twitter, blogs, discussion forums), result language (22 available options), delivery frequency, and whether to receive all results or only high-engagement mentions. The service is free to use.

TaskRunner is a freeware application from Key Efficiency for automating common tasks. Its central function is a Task Scheduler that can run executables and scripts, back up files locally or to FTP, send emails and notifications, monitor processes and services on local or remote machines, ping IPs, and perform system cleanup. It also includes an FTP Browser, Email Monitor, Shortcut Toolbar and Web Search tool.

Telegram Search. Search for posts

tgstat.com

TGStat search page for finding Telegram posts, channels, and public mentions by keyword.