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

https://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)

https://www.tarsnap.com/

Shell wrapper for tclsh (Tcl)

Tool Command Language

https://www.tcl.tk/

Collection of utility modules for Tcl

https://tcllib.sourceforge.net/

Tool to replay saved packet capture files

https://github.com/appneta/tcpreplay

Packet sniffer which displays TCP information like top(1)

https://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

https://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/

Terminal Emulator for GNUstep

https://www.nongnu.org/backbone/

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

https://jadetex.sourceforge.net/

Path searching library for TeX

Library for Japanese pTeX and its tools

Meta-port that creates a site-local TEXMF directory

TeX implementation translating WEB to C

Non-validating XML parser, written in TeX

Texinfo to HTML converter

http://texi2html.cvshome.org/

Typeset documentation system with multiple format output

https://www.gnu.org/software/texinfo/

TeX Live Typesetting System, base binaries

https://tug.org/texlive/

TeX Live Typesetting System, texmf Tree

https://tug.org/texlive/

TeXLive manager modules

Tiny/turbo/throttling HTTP server

https://www.acme.com/software/thttpd/

The virtual filesystem for Thunar

https://xfce.org/

Fixes and tidies up HTML files

https://www.w3.org/People/Raggett/tidy/

Utility to clean up and pretty print HTML/XHTML/XML

http://tidy.sourceforge.net/

Tidy tidies HTML and XML documents

https://www.html-tidy.org/

Utility to clean up and pretty print HTML/XHTML/XML (with shared lib)

http://tidy.sourceforge.net/