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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.

Spicetify

spicetify.app

Spicetify is a command-line tool for customizing the Spotify client. It supports themes that change colors, fonts, and visual styling, extensions that add new features, and custom apps that add entirely new pages to Spotify's sidebar. Customizations can be installed through the built-in Marketplace browser or manually and applied with CLI commands.

SpookyGhost

encelo.itch.io

SpookyGhost is an open source tool by Encelo for creating procedural animations for sprites. It animates properties such as size, rotation, position and color, and allows users to deform sprite shapes. Lua scripts can be written for custom animations, and results can be exported as single frames or a spritesheet. Native versions are available for Windows, macOS, Linux and Android.

SpotX-Bash

github.com

SpotX-Bash is an open source command-line or Unix tool for terminal workflows and system use.

ss64

ss64.com

SS64 is a reference guide containing syntax and examples for prevalent computing commands for database and operating systems, covering Windows CMD, PowerShell, MacOS, Linux bash and SQL Server. The site is developed by Simon Sheppard and distributed under a Creative Commons Attribution-NonCommercial licence.

ss64 macOS

ss64.com

SS64 macOS is an A-Z index of Apple macOS bash commands. Each entry gives a short description of a command, such as afconvert for audio file conversion or cat for displaying file content.

sshx is a web-based collaborative terminal that lets users share a terminal with others by link on a multiplayer infinite canvas. It offers real-time collaboration with remote cursors and chat, end-to-end encryption, and a lightweight server written in Rust. It is available as a command-line tool for macOS, Linux and Windows.

Stalwart is an open-source mail and collaboration server written in Rust. It supports JMAP, IMAP4, POP3, SMTP, CalDAV, CardDAV and WebDAV, combining email, calendars, contacts and file storage in one server with built-in spam and phishing protection. It runs as a single node or as a cluster.

Starship

starship.rs

Starship is a minimal and customizable prompt for any shell that shows the information the user needs. Quick installation is available for Bash, Fish, ZSH, Ion, Tcsh, Elvish, Nu, Xonsh, Cmd, and PowerShell. It is written in Rust and works on the most common shells and operating systems.

Startup Launcher

github.com

Distrod is a systemd-based meta-distro for WSL 2 that installs distributions such as Ubuntu, Arch Linux and Gentoo with systemd, or makes a current distro run systemd. It provides a built-in auto-start feature and a port forwarding service, allowing systemd-managed services to start on Windows startup and be reachable from outside Windows.

Stats

mac-stats.com

Stats is a free, open-source macOS system monitor that runs in the menu bar and tracks CPU, GPU, RAM, disk, network, sensors, battery, Bluetooth and a clock. The app requires macOS 12 or later and supports Apple Silicon and Intel Macs. It offers 13 customizable widgets and is available as a direct download or via Homebrew.

Steam Link

store.steampowered.com

Steam Remote Play is a Steam feature for streaming games from a PC to other devices. Steam Link connects a device to a computer running Steam, and the app is offered for iOS, Android, Amazon Fire TV, Raspberry Pi, Windows, Linux, macOS and Meta Quest. Remote Play Together lets friends join local multiplayer games over the internet.

steam-online-fix-launcher

github.com

Steam Online Fix Launcher (SOFL) is a tool for easily launching and organizing online-fix games on Linux.

steamguard-cli

github.com

A linux utility for generating 2FA codes for Steam and managing Steam trade, market, and other confirmations.

Stoat is an open-source group chat app for friends and communities, offering servers, channels, voice chat, file sharing and markdown support. It is available on Windows, macOS, Linux, Android, iOS and the web, with accounts and settings synced across devices. Group DMs support up to 50 members. The code is public and the project is described as free and open source.

Storyboarder

wonderunit.com

Storyboarder is a free, open-source tool for visualizing a story as storyboards. It offers six simple drawing tools, adding boards with a click, and entering dialogue, action, timing and shot type. Boards can be edited in Photoshop and update automatically on save. It is available for Mac OS X, Windows and Linux.

Strawberry

strawberrymusicplayer.org

Strawberry is a cross-platform music player and music collection organizer for Linux, macOS and Windows, aimed at music collectors and audiophiles. It lets users play and manage their digital music collection or stream radio stations. The free software is a fork of Clementine, written in C++ with the Qt framework and GStreamer.

streamlink-ttvlol

github.com

Streamlink Twitch plugin modified to work with the TTV.LOL API. It proxies playlist requests to a country where Twitch does not serve ads, and adds plugin arguments for proxy playlist servers, excluded channels and fallback to Twitch servers. Installation instructions cover Windows, Linux and MacOS.

StreamTim is a tool for streaming torrent movies in VLC. It does not need to be installed; users download it, uncompress it and run it, then click a torrent movie's magnet link. Windows and Linux downloads are offered.

Stremio

stremio.com

Stremio is a media center for watching movies, TV series, TV channels and podcasts, with an addon system for content. It is available for Windows, Mac, Linux, Android, Android TV and LG TV, and keeps track of watch progress across devices. It is open-source and includes Chromecast support.

sttr

github.com

sttr is a cross-platform command line application for running transformation operations on strings. It accepts direct input, file input, or input piped from other commands such as cat, curl and printf, and can write output to a file. Supported operations include encoding and decoding formats such as Base32, Base64 and Ascii85, plus hashing and JSON/YAML conversion.

StudyCraft

studycraft.dev

StudyCraft is an open source, free study tool available for Windows, MacOS and Linux. It allows users to import study materials including PDFs, Markdown files, webpages and GitHub repositories, which are automatically indexed into a vector database for semantic search. Users can customize their imported content, and the tool automatically generates flashcard decks and practice tests, plus provides study session analytics to track progress. It supports self-hosted and cloud-hosted large language model integrations and is built for fast performance.

Subtitld

subtitld.org

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.

Subtitle Generator

tom-moroney.com

AutoSubs is a free, open-source tool for generating subtitles with AI models that run entirely on the user's machine. It works standalone or integrates with DaVinci Resolve, Premiere Pro and After Effects. It includes subtitle formatting, word-level timing and speaker labeling, and runs on Mac, Windows and Linux under the MIT license.