Library and program to validate and fix HTML

http://tidyp.com/

Tools and library routines for working with TIFF images

http://www.simplesystems.org/libtiff/

TigerVNC Server

https://tigervnc.org/

JACK audio capture tool

http://plugin.org.uk/timemachine/

CPU time usage monitor for GNUstep

http://www.nongnu.org/gap/timemon/index.html

MIDI to PCM software synthesizer

http://www.onicos.com/staff/iz/timidity/

Analogous to cdb, but faster

https://www.corpit.ru/mjt/tinycdb.html

server which provides telnet(1) access to one or more tty ports

Shell wrapper for wish (Tk)

Graphical toolkit for Tcl

http://www.tcl.tk/

Tk library to access to X Shaped Window Extension

https://www.cs.man.ac.uk/~fellowsd/tcl/shapeidx.html

Extremely portable perl-based make utility

http://tmake.sourceforge.net/

Enhanced ftp client from NetBSD

https://ftp.netbsd.org/pub/NetBSD/misc/tnftp/

Open-source Java web server by Apache, 9.0.x branch

https://tomcat.apache.org/

Toolbox bundle for GNUstep

http://www.nongnu.org/toolbox/

Efficient way to prepare zipfiles for BitTorrent

http://trrntzip.sourceforge.net

GObject-based library to parse a host of playlist formats

Trusted Platform Module (TPM) emulator

http://tpm-emulator.berlios.de/

Traditional (K&R-style) C preprocessor

https://www.NetBSD.org/~dholland/tradcpp/

Tools to convert Xfig .fig files

Transmission BitTorrent client

https://www.transmissionbt.com

Meta-port for Transmission BitTorrent client

http://www.transmissionbt.com/

Meta-port for Transmission BitTorrent client

http://www.transmissionbt.com/

Meta-port for Transmission BitTorrent client

http://www.transmissionbt.com/

Meta-port for Transmission BitTorrent client

http://www.transmissionbt.com/

Open-source TCG Software Stack

https://sourceforge.net/projects/trousers/

Allow non SOCKS aware applications to use SOCKS without modification

https://tsocks.sourceforge.net

True Type Font to Postscript Type 1 Converter

https://ttf2pt1.sourceforge.net/

3D penguin racing game using OpenGL

http://tuxracer.sourceforge.net/

Tab Window Manager for the X Window System

MPEG Audio Layer 2 encoder

http://twolame.sf.net/

Converts flat ASCII text to man page format

http://mvertes.free.fr/

GTK+ 2.x engine from Ubuntu Dapper

http://packages.ubuntu.com/feisty/source/ubuntulooks

Data compression library with low memory usage

https://www.oberhumer.com/opensource/ucl/

Command-line tools for building TCP client-server applications

https://cr.yp.to/ucspi-tcp.html

DNS resolver library with sync and async queries

https://www.corpit.ru/mjt/udns.html

Fast copy utility for UFS filesystem

http://people.freebsd.org/~simokawa/ufs/

HTTP web service mocking library for GNOME

https://gitlab.com/groups/uhttpmock

Convert MagicISO UIF files to ISO9660

http://aluigi.altervista.org/mytoolz.htm

Ultra lightweight xml-rpc library written in C++

http://ulxmlrpcpp.sourceforge.net/

Extract, view & test ACE archives

http://www.winace.com/

Allows files to be extracted from ARJ archives

http://www.arjsoftware.com/

Validating, recursive, and caching DNS resolver

https://www.nlnetlabs.nl/projects/unbound

Remove idle cursor image from screen

Unicode emoji data files

http://www.unicode.org/emoji

Library for single instance applications

http://live.gnome.org/LibUnique

Convert ASCII newlines between CR/LF and LF

ODBC library suite for Unix

http://www.unixodbc.org/

BYTE magazine's Public Domain benchmark for UNIX

https://github.com/kdlucas/byte-unixbench

Extract Makeself archives