DocBook/SGML DTD V4.3, designed for technical documentation

http://www.docbook.org/sgml/4.3/index.html

DocBook/SGML DTD V4.5, designed for technical documentation

http://www.docbook.org/specs/docbook-4.5-spec-cs-01.html

XML version of the DocBook DTD version controlled for ScrollKeeper

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

DocBook SGML DTD into nroff/troff -man macros converter

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

DocBook XML DTD

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

DocBook/XML DTD V4.3, designed for technical documentation

http://www.docbook.org/xml/4.3/index.html

DocBook/XML DTD V4.4, designed for technical documentation

http://www.docbook.org/xml/4.4/index.html

DocBook/XML DTD V4.5, designed for technical documentation

http://www.docbook.org/xml/4.5/index.html

DocBook W3C XML Schema

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

XSL DocBook stylesheets

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

Emacs lisp modules for editing DocBook documents

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

Dockapp with support for GNOME2 and KDE3 tray icons

http://icculus.org/openbox/2/docker/

DOCSIS(tm) binary configuration file encoder/decoder

https://github.com/rlaager/docsis

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

http://doomlegacy.sourceforge.net/

UNIX rewrite of a game originally based on "Drug Wars"

http://dopewars.sourceforge.net/

Emulator of a PC with DOS

http://dosbox.sourceforge.net/

Secure, fast and powerful IMAP and POP3 server

https://www.dovecot.org/

Secure, fast and powerful IMAP and POP3 server

http://www.dovecot.org/

OpenGL hardware acceleration drivers for the DRI

http://dri.sourceforge.net/

DRI2 prototype headers

http://www.freedesktop.org/wiki/Software/xlibs

The Droid typeface family

https://www.droidfonts.com/

DSSSL stylesheets for the DocBook DTD by Norman Walsh

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

Silently consume flash MIME types

http://www.gsoft.com.au/~doconnor/nullflash.html

DVD burning software

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

Backup content from DVD to hard disk

http://dvdbackup.sourceforge.net/

Utilities & library to manipulate ext2/3/4 filesystems

http://e2fsprogs.sourceforge.net/

Blkid library from e2fsprogs package

http://e2fsprogs.sourceforge.net/

UUID library from e2fsprogs package

http://e2fsprogs.sourceforge.net/

Accessing and converting various ebook file formats

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

Dynamic resource editor for X Toolkit Applications

Fax send/receive program

D-Bus bindings for GObject

http://cgit.freedesktop.org/~david/eggdbus

Lightweight library for vector and matrix math

http://eigen.tuxfamily.org/

Lightweight library for vector and matrix math

http://eigen.tuxfamily.org/

Dictionary/spellchecking framework

http://www.abisource.com/projects/enchant/

X.Org Encoding fonts

https://www.x.org/

ASCII to PostScript filter

http://www.gnu.org/software/enscript/

ASCII to PostScript filter

http://www.gnu.org/software/enscript/

Extensible shell, derived from plan9's rc

http://wryun.github.io/es-shell/

The "easy shell", a small shell with Lisp-like syntax

Sound library for enlightenment package

http://www.tux.org/~ricdude/EsounD.html

Software speech synthesizer

http://espeak.sourceforge.net/

XEVIE extension headers

http://www.freedesktop.org/wiki/Software/xlibs

Port of Adobe XMP SDK to work on UNIX

http://libopenraw.freedesktop.org/wiki/Exempi

Command line utility to read and manipulate EXIF data

http://sourceforge.net/projects/libexif/

Exif, IPTC, and XMP metadata manipulation library and tools

https://www.exiv2.org/

XML 1.0 parser written in C

https://github.com/libexpat/libexpat

Sophisticated scripter based on Tcl/Tk

http://expect.sourceforge.net