| siril | Astrophotographic image processing tool |
| sparrow3d | Software renderer for different open handhelds like the gp2x, wiz, caanoo and pandora |
| tgt | iSCSI Target daemon with RDMA support |
| schedtool | Query or alter a process' scheduling policy under Linux |
| tetrio-plus | Modified TETR.IO desktop app.asar with many customization tools |
| symphony | Open-source solver, callable library, and development framework for mixed-integer linear programs (MILPs) |
| seadrive-gui | GUI part of Seafile drive |
| sqlite-jdbc | Library for accessing and creating SQLite database files in Java |
| sony-headphones-client | Client recreating the functionality of the Sony Headphones app |
| semodule-utils | SELinux policy core utilities (packaging additions) |
| sview | Viewer for 3D stereoscopic videos and images |
| seafile-shared | Shared components of Seafile: seafile-daemon, libseafile, libseafile python bindings, manuals, and icons |
| sope | Extensive set of frameworks which form a complete Web application server environment |
| slstatus | Status monitor for window managers that use WM_NAME like dwm |
| sfrotz | Interpreter for Infocom and other Z-Machine games (SDL interface) |
| thinkfan | Simple, lightweight fan control program |
| thunar-dropbox-plugin | Plugin that adds context-menu items for Dropbox to Thunar |
| signify | OpenBSD signing tool |
| soxt | GUI binding for using Open Inventor with Xt/Motif |
| simple-scan | Simple scanning utility |
| seren | Simple ncurses VoIP program based on the Opus codec |
| soundconverter | Leading audio file converter for the GNOME Desktop |
| tacent | C++ library providing linear algebra and various utility functions |
| simpleitk | Simplified interface to ITK |
| streamcontroller | Elegant Linux app for the Elgato Stream Deck with support for plugins |
| sfwbar | Flexible taskbar application for wayland compositors, designed with a stacking layout in mind |
| stepmania | Free dance and rhythm game for Windows, Mac, and Linux |
| systemdgenie | Systemd management utility |
| swiftshader | High-performance CPU-based implementation of the Vulkan 1.3 graphics API |
| srandrd | Simple randr daemon |
| spice-up | Create simple and beautiful presentations |
| sentry-native | Sentry SDK for C, C++ and native applications |
| spaceFM | Multi-panel tabbed file manager |
| swaylock-effects | Screen locker for Wayland |
| srb2kart | Classic styled kart racer |
| solidtime-desktop | Modern open-source time-tracking app |
| tiptop | Performance monitoring tool for Linux |
| tcp_wrappers | TCP Wrappers, a network logger, also known as TCPD or LOG_TCP |
| sorcer | Wavetable LV2 plugin synth, targeted at the electronic / dubstep genre |
| schemes | Edit GtkSourceView style-schemes for an application or platform |
| supergee | Vala based UI for beets |
| skawarePackages.sdnotify-wrapper | Use systemd sd_notify without having to link against libsystemd |
| shaderbg | Shader-based live wallpaper program for compositors that support wlr-layer-shell (Sway and others) |
| tbe | Physics-based game vaguely similar to Incredible Machine |
| simutrans_binaries | Simulation game in which the player strives to run a successful transport system |
| smartdns | Local DNS server to obtain the fastest website IP for the best Internet experience |
| snapper-gui | Graphical interface for snapper |
| stdoutisatty | Make programs think their stdout is a tty / terminal |
| sticky | Sticky notes app for the Linux desktop |
| supermin | Tool for creating and building supermin appliances |
| solfege | Ear training program |
| scanbd | Scanner button daemon |
| tiny-cuda-nn | Lightning fast C++/CUDA neural network framework |
| smemstat | Memory usage monitoring tool |
| thunar | Xfce file manager |
| sniproxy | Transparent TLS and HTTP layer 4 proxy with SNI support |
| show-midi | Multi-platform GUI application to effortlessly visualize MIDI activity |
| speedtest | Graphical librespeed client written using GTK4 + libadwaita |
| sonic-visualiser | View and analyse contents of music audio files |
| tinycdb | Utility to manipulate constant databases (cdb) |
| sonic-pi | Free live coding synth for everyone originally designed to support computing and music lessons within schools |
| tetgen_1_4 | Quality Tetrahedral Mesh Generator and 3D Delaunay Triangulator |
| sleep-on-lan | Multi-platform process allowing to sleep on LAN a Linux or Windows computer, through wake-on-lan (reversed) magic packets or through HTTP REST requests |
| simutrans | Simulation game in which the player strives to run a successful transport system |
| solarc-gtk-theme | Solarized version of the Arc theme |
| throne | Qt based cross-platform GUI proxy configuration manager |
| slacky | Unofficial Slack desktop client for arm64 Linux |
| tdnf | Tiny Dandified Yum |
| tela-circle-icon-theme | Flat and colorful personality icon theme |
| seturgent | Set an application's urgency hint (or not) |
| sqlitestudio-plugins | Official plugins for SQLiteStudio, a free, open source, multi-platform SQLite database manager |
| sway-launcher-desktop | TUI Application launcher with Desktop Entry support |
| thunar-volman | Thunar extension for automatic management of removable drives and media |
| screenconfig | Automatic configuration of connected screens/monitors |
| target-isns | iSNS client for the Linux LIO iSCSI target |
| timekpr | Manages and restricts user screen time by enforcing time limits |
| srsran | Open-source 4G and 5G software radio suite |
| simpledbus | C++ wrapper for libdbus-1 |
| tayga | Userland stateless NAT64 daemon |
| synthv1 | Old-school 4-oscillator subtractive polyphonic synthesizer with stereo fx |
| sblast | Blast your Linux audio to DLNA receivers |
| sweethome3d.textures-editor | Easily create SH3T files and edit the properties of the texture images it contain |
| swaynotificationcenter | Simple notification daemon with a GUI built for Sway |
| spice-autorandr | Automatically adjust the client window resolution in Linux KVM guests using the SPICE driver |
| taskserver | Server for synchronising Taskwarrior 2 clients |
| solarus | Zelda-like ARPG game engine |
| sequeler | Friendly SQL Client |
| tahoe-lafs | Tahoe-LAFS, a decentralized, fault-tolerant, distributed storage system |
| showmethekey | Show keys you typed on screen |
| setserial | Serial port configuration utility |
| tini | Tiny but valid init for containers |
| sks | Easily deployable & decentralized OpenPGP keyserver |
| swi-prolog-gui | Prolog compiler and interpreter |
| speedscope | Fast and interactive web-based viewer for performance profiles |
| st-snazzy | Snazzy terminal (suckless + beautiful) |
| ser2net | Serial to network connection server |
| seaview | GUI for molecular phylogeny |
| swiften | XMPP library for C++, used by the Swift client |
| signing-party | Collection of several projects relating to OpenPGP |
| singularity-overriden-nixos | |