Similar to それがぼくには楽しかったから

Dia (software)

DigiKam

Dirac (video compression format)

DirectFB

Distcc

Doom Emacs

DOSBox

Droid (typeface)

Dvd+rw-tools

Dwm

Ehcache

Embedded GLIBC

EmuTOS

Enigmail

GNOME Evolution

Exim

Express.js

Eye of GNOME

F-Spot

FabFi

Ffdshow

FIGlet

File System Visualizer

FLAC