Tool for statically checking sourcecode for security vulnerabilities

http://www.splint.org/

The Spring Framework for Java

https://www.springframework.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/

Squeeze is a modern and advanced archive manager

http://squeeze.xfce.org/

HTTP Caching Proxy

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

Webmail system which accesses mail over IMAP

http://www.squirrelmail.org/

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/

Advanced IP/IPv6 subnet calculation and discovery

http://www.seccuris.com

Version control system

http://subversion.apache.org/

Version control system

http://subversion.apache.org/

Allow others to run commands as root

https://www.sudo.ws/

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/

Low level console graphics library

http://www.svgalib.org/

Summarizes and manages differences between local files and Subversion

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

Gnome swell-foop

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

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

http://www.swig.org/

Mouse and keyboard sharing utility

https://symless.com/synergy

Helps to install application configuration files

http://www.Courier-MTA.org/sysconftool/

Network tool designed for high performance and accurate monitoring

http://puck.nether.net/sysmon/

Backend system admin scripts for gnome-system-tools

http://www.gnome.org/projects/gst/

System Preferences application for GNUstep

http://www.gnustep.org/experience/systempreferences.html

Lossless compression library for scientific data

https://support.hdfgroup.org/doc_resource/SZIP/

Type 1 font rasterization library for Unix/X11

https://www.t1lib.org/

Six utilities for manipulating t1 fonts

https://www.lcdf.org/~eddietwo/type/

Library for manipulating ID3 tags and Ogg comments

http://taglib.github.com/

Gnome tali

https://wiki.gnome.org/Apps/Tali

IRC client for GNUstep

http://gap.nongnu.org/talksoup/

Hierarchical pool based memory allocator

https://talloc.samba.org/

Online encrypted backup service (client)

http://www.tarsnap.com/

Shell wrapper for tclsh (Tcl)

Tool Command Language

http://www.tcl.tk/

Tool to replay saved packet capture files

https://github.com/appneta/tcpreplay

Packet sniffer which displays TCP information like top(1)

http://BSDforge.com/projects/net-mgmt/tcptrack/

Set of configuration scripts for the TCSH shell

http://tcshrc.sourceforge.net/

Trivial Database

https://tdb.samba.org/

Toolkit for converting data between 8-bit legacy encodings and Unicode

http://scripts.sil.org/TECkit

GLib utility library for the Telepathy framework

https://telepathy.freedesktop.org/

Logger utility library for the Telepathy framework

https://telepathy.freedesktop.org/

Talloc based event loop library

https://tevent.samba.org/

Basic TeX Engines

https://tug.org/texlive/

Convert a TeX DVI file to PostScript

Formats for basic TeX engines and the latex command

https://tug.org/texlive/

TeX backend for Jade, DSSSL processor for SGML/XML documents

http://jadetex.sourceforge.net/

Path searching library for TeX

Library for Japanese pTeX and its tools