Similar to GRASS_GIS

DirectFB

Discourse (software)

Distcc

Dlib

Docker (software)

Dolphin (file manager)

Dolphin (emulator)

Dragon Player

Drupal

DSpace

Dvd+rw-tools

Device independent file format#DVI-to-PDF converters

Dvips

Eclipse (software)

EGS (program)

Embedded GLIBC

Erlang (programming language)

Mule (software)

Etherpad

Exaile

XMPP