Standalone JavaScript based from Mozilla 68-esr

https://spidermonkey.dev/

Standalone JavaScript based from Mozilla 78-esr

https://spidermonkey.dev/

Standalone JavaScript based from Mozilla 91-esr

https://spidermonkey.dev/

SpiderOak Client (Linux version)

https://spideroak.com/

Tools for processing SPIR-V intermediate shader language modules

https://github.com/KhronosGroup/SPIRV-Tools

Monospaced bitmap fonts for Xorg and vt(4)

https://github.com/fcambus/spleen

Tool for statically checking sourcecode for security vulnerabilities

http://www.splint.org/

Lightweight Spotify client using Qt

https://github.com/kraxarn/spotify-qt

Spotify for the terminal written in Rust

https://github.com/Rigellute/spotify-tui

Spotify daemon

https://github.com/Spotifyd/spotifyd

The Spring Framework for Java

https://www.springframework.org/

Double entry accounting system

http://www.sql-ledger.org/

Lightweight database abstraction layer

SQL database engine in a C library

http://www.sqlite.org/

SQL database engine in a C library

https://www.sqlite3.org/

HTTP Caching Proxy

http://www.squid-cache.org/

Webmail system which accesses mail over IMAP

http://www.squirrelmail.org/

Library for serialising LV2 atoms to/from RDF

http://drobilla.net/software/sratom

Secure Reliable Transport (SRT) Protocol

https://www.srtalliance.org/

Chat over SSH

https://github.com/shazow/ssh-chat

Protect hosts from brute-force attacks against SSH and other services

https://www.sshguard.net/

State Threads Library for Internet Applications

http://state-threads.sourceforge.net/

Library that supports startup notification spec from freedesktop.org

https://www.freedesktop.org/wiki/Software/startup-notification/

Monospace font created for the French magazine Etapes

https://raphaelbastide.com/steps-mono

OpenType Unicode fonts for Scientific, Technical, and Math texts

http://www.stixfonts.org/

Command-line utility that pipes video streams

https://streamlink.github.io/

Stuffit Archive Creator and Expander

http://my.smithmicro.com/unix/stuffit/

Advanced IP/IPv6 subnet calculation and discovery

http://www.seccuris.com

Sophisticated text editor for code, markup and prose

http://www.sublimetext.com

Subsonic streaming media server, standalone version

http://www.subsonic.org

Version control system

http://subversion.apache.org/

Version control system, long-time-support version

http://subversion.apache.org/

Allow others to run commands as root

https://www.sudo.ws/

Font for programmers and command line users

https://www.kutilek.de/sudo-font

C library for loading and wrapping LV2 plugin UIs

http://drobilla.net/software/suil/

SuiteSparse is a set of packages for sparse matrices calculation

http://faculty.cse.tamu.edu/davis/suitesparse.html

Super Tux is a side-scroller similar to Super Mario Brothers

http://supertuxproject.org/

Tool similar to Gloobus Preview that provides quick file previews

http://www.ubuntugeek.com/gnome-sushi-quick-previewer-for-nautilus.html

X11 font designed to be small yet easily read

http://www.goof.com/pcg/marc/suxus.html

Low level console graphics library

http://www.svgalib.org/

Summarizes and manages differences between local files and Subversion

http://www.incava.org/projects/svndelta/

Scalable AV1 encoder

https://01.org/svt

Scalable HEVC encoder

https://01.org/svt

Scalable VP9 encoder

https://01.org/svt

Gnome swell-foop

https://wiki.gnome.org/Swell%20Foop

Generate wrappers for calling C/C++ code from other languages

http://www.swig.org/

Generate wrappers for calling C/C++ code from other languages

http://www.swig.org/

Lightweight image viewer

https://github.com/muennich/sxiv

Basic Latin, Greek, Cyrillic and many Symbol blocks of Unicode

http://users.teilar.gr/~g1951d/

Mouse and keyboard sharing utility

https://symless.com/synergy