DocBook SGML DTD into nroff/troff -man macros converter

https://www.oasis-open.org/docbook/tools/dtm/

Generates various output formats from DocBook SGML documents

https://www.sourceware.org/docbook-tools/

DocBook XML DTD

https://www.oasis-open.org/docbook/

DocBook W3C XML Schema

https://www.oasis-open.org/docbook/xmlschema/1.0b1/

XSL DocBook stylesheets

http://docbook.sourceforge.net/projects/xsl/

Namespace-aware DocBook XSLT stylesheets

https://docbook.sourceforge.net

Emacs lisp modules for editing DocBook documents

http://nwalsh.com/emacs/docbookide/

DOCSIS(tm) binary configuration file encoder/decoder

https://github.com/rlaager/docsis

Command-line DNS client

https://dns.lookup.dog/

DNS-over-HTTP server proxy

https://github.com/DNSCrypt/doh-server

Doom data files (Doom, Doom II, Hexen, Heretic and Strife)

Complete Doom-based game IWAD that is Free Software

http://freedoom.sf.net/

Improved and extended version of Doom

https://doomlegacy.sourceforge.net/

Emulator of a PC with DOS

http://dosbox.sourceforge.net/

Simple, powerful configuration-file parser

https://github.com/williamh/dotconf

Binary-decimal and decimal-binary routines for IEEE doubles

https://github.com/google/double-conversion

Doulos SIL TrueType font collection

http://scripts.sil.org/cms/scripts/page.php?item_id=DoulosSILfont

Doulos SIL TrueType font collection, compact variant

http://scripts.sil.org/cms/scripts/page.php?item_id=DoulosSILfont

Secure, fast and powerful IMAP and POP3 server

https://www.dovecot.org/

Sieve plugin for the Dovecot 'deliver' LDA and LMTP

https://wiki2.dovecot.org/Pigeonhole

Documentation system for C, C++, and other languages

https://www.doxygen.org/

The Droid typeface family

https://www.droidfonts.com/

Database driven web content management system (CMS)

https://www.drupal.org/

Database driven web content management system (CMS)

https://www.drupal.org/

Database driven web content management system (CMS)

https://www.drupal.org/

DSSSL stylesheets for the DocBook DTD by Norman Walsh

https://sourceforge.net/projects/docbook/

Device Tree Compiler

https://git.kernel.org/cgit/utils/dtc/dtc.git

Spawns dhclients for a dual-stack network

Embeddable Javascript engine

https://duktape.org/

Python implementation of the Git file formats and protocols

https://www.dulwich.io/

English to Thai dictionary for GNUstep

https://www.eskimo.com/~pburns/Dictionaries/

Duo unix integration package

https://duosecurity.com

Backup tool that uses librsync and GnuPG

https://duplicity.gitlab.io/

Shell front end for the duplicity backup tool

https://duply.net

DVD burning software

http://fy.chalmers.se/~appro/linux/DVD+RW/

Backup content from DVD to hard disk

https://dvdbackup.sourceforge.net/

Wrapper to install e2fsprogs into /sbin

Blkid library from e2fsprogs package

https://e2fsprogs.sourceforge.net/

Command-line interface parsing library from e2fsprogs

UUID library from e2fsprogs package

https://e2fsprogs.sourceforge.net/

EFL DBUS connectivity library

http://docs.enlightenment.org/api/e_dbus/html/

Small RSA key management package based on openssl

https://github.com/OpenVPN/easy-rsa

GNUstep graphical diff

Accessing and converting various ebook file formats

https://sourceforge.net/projects/ebook-tools/

Startup scripts for FreeBSD/EC2 environment

https://www.daemonology.net/freebsd-on-ec2/

Scientific calcultor for GNUstep

https://www.eskimo.com/~pburns/EdenMath/

Dynamic resource editor for X Toolkit Applications

Fax send/receive program

Enlightenment Foundation Libraries

https://docs.enlightenment.org/efl/current/

Speech server for Festival Lite used by yasr and Emacspeak

https://eflite.sourceforge.net/